Port Format
Here’s how to port your mobile number in 8 easy steps – India …
Before initialising the porting process, note that your existing connection must be active fo 90 days and all your bills should be cleared. Mobile Number PortabilityThanks to Mobile Number Portability (MNP), you won’t have to put up with your mobile service provider just to retain your number.
Through MNP, you can easily change your service provider without having to let go of your number. But before initialising this process, note that your existing connection must be active for 90 days and all your bills should be llowing are the steps which will help you to port your number:1. First, choose the service provider you wish to port your number to. 2. Send the following text message – PORT followed by your 10-digit mobile number to TRAI’s central number for mobile number portability – 1900. Example: Send ‘PORT 98xxxxxx98’ to 1900. You’ll receive an SMS back with a port out code which will remain valid for only 15 days. 3. Visit your nearest operator store and tell them you want to port your sim. They will fill the porting form and customer acquisition form for port into the, carry a passport size photograph and a self attested copy of identity proof. As an address proof you can submit a copy of the rent agreement, landline bill, electricity bill, or a three month bank statement. 4. Next step is to submit your duly filled porting form and CAF along with requisite documentary proof of the mobile service provider to the operator. 5. If you are a postpaid subscriber, submit a paid copy of the last bill issued along with the porting form and CAF. 6. Once you are done with the necessary formalities, obtain your SIM card from the new service provider. Depending on the service provider, you’ll be charged up to Rs 19 for porting. 7. The process usually takes seven working days to complete. For Jammu & Kashmir, Assam, and North East, it may take up to 15 new mobile service provider will keep you updated about the date and time of porting via SMS. 8. Replace the old SIM with the new SIM provided by your new mobile service provider after the specified date and to be notedThe services on your current SIM will not be interrupted during porting process. The downtime is for around 2 hours (during night)Subscriber can withdraw the porting request within 24 hrs of more info, you can visit Telecom Regulatory Authority of IndiaRead | Republic Day 2019 tickets: Price, date, time, where and how to buyClick here for ’s complete coverage of the coronavirus pandemic.
Port (computer networking) – Wikipedia
This article is about software communication ports. For physical ports, see Computer port (hardware).
“port (network)” redirects here. For ports in electrical networks, see Port (circuit theory).
In computer networking, a port is a communication endpoint. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service. A port is identified for each transport protocol and address combination by a 16-bit unsigned number, known as the port number. The most common transport protocols that use port numbers are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
A port number is always associated with an IP address of a host and the type of transport protocol used for communication. It completes the destination or origination network address of a message. Specific port numbers are reserved to identify specific services so that an arriving packet can be easily forwarded to a running application. For this purpose, port numbers lower than 1024 identify the historically most commonly used services and are called the well-known port numbers. Higher-numbered ports are available for general use by applications and are known as ephemeral ports.
Ports provide a multiplexing service for multiple services or multiple communication sessions at one network address. In the client–server model of application architecture, multiple simultaneous communication sessions may be initiated for the same service.
Port number[edit]
A port number is a 16-bit unsigned integer, thus ranging from 0 to 65535. For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port. A process associates its input or output channels via an internet socket, which is a type of file descriptor, associated with a transport protocol, an IP address, and a port number. This is known as binding. A socket is used by a process to send and receive data via the network. The operating system’s networking software has the task of transmitting outgoing data from all application ports onto the network, and forwarding arriving network packets to processes by matching the packet’s IP address and port number to a socket. For TCP, only one process may bind to a specific IP address and port combination. Common application failures, sometimes called port conflicts, occur when multiple programs attempt to use the same port number on the same IP address with the same protocol.
Applications implementing common services often use specifically reserved well-known port numbers for receiving service requests from clients. This process is known as listening, and involves the receipt of a request on the well-known port potentially establishing a one-to-one server-client dialog, using this listening port. Other clients may simultaneously connect to the same listening port; this works because a TCP connection is identified by a tuple consisting of the local address, the local port, the remote address, and the remote port. [1] The well-known ports are defined by convention overseen by the Internet Assigned Numbers Authority (IANA). In many operating systems special privileges are required for applications to bind to these ports because these are often deemed critical to the operation of IP networks. Conversely, the client end of a connection typically uses a high port number allocated for short term use, therefore called an ephemeral port.
Common port numbers[edit]
IANA is responsible for the global coordination of the DNS root, IP addressing, and other protocol resources. This includes the registration of commonly used port numbers for well-known internet services.
The port numbers are divided into three ranges: the well-known ports, the registered ports, and the dynamic or private ports.
The well-known ports (also known as system ports) are those numbered from 0 through 1023. The requirements for new assignments in this range are stricter than for other registrations. [2]
Notable well-known port numbers
Number
Assignment
20
File Transfer Protocol (FTP) Data Transfer
21
File Transfer Protocol (FTP) Command Control
22
Secure Shell (SSH) Secure Login
23
Telnet remote login service, unencrypted text messages
25
Simple Mail Transfer Protocol (SMTP) email delivery
53
Domain Name System (DNS) service
67, 68
Dynamic Host Configuration Protocol (DHCP)
80
Hypertext Transfer Protocol (HTTP) used in the World Wide Web
110
Post Office Protocol (POP3)
119
Network News Transfer Protocol (NNTP)
123
Network Time Protocol (NTP)
143
Internet Message Access Protocol (IMAP) Management of digital mail
161
Simple Network Management Protocol (SNMP)
194
Internet Relay Chat (IRC)
443
HTTP Secure (HTTPS) HTTP over TLS/SSL
The registered ports are those from 1024 through 49151. IANA maintains the official list of well-known and registered ranges. [3]
The dynamic or private ports are those from 49152 through 65535. One common use for this range is for ephemeral ports.
Network behavior[edit]
Transport-layer protocols, such as the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP), transfer data using protocol data units (PDUs). For TCP, the PDU is a segment, and for UDP it is a datagram. Both protocols use a header field for indicating the source and destination port numbers. The port numbers are encoded in the transport protocol packet header, and they can be readily interpreted not only by the sending and receiving hosts but also by other components of the networking infrastructure. In particular, firewalls are commonly configured to differentiate between packets based on their source or destination port numbers. Port forwarding is an example application of this.
Port scanning[edit]
The practice of attempting to connect to a range of ports in sequence on a single host is commonly known as port scanning. This is usually associated either with malicious cracking attempts or with network administrators looking for possible vulnerabilities to help prevent such attacks. Port connection attempts are frequently monitored and logged by hosts. The technique of port knocking uses a series of port connections (knocks) from a client computer to enable a server connection.
Examples[edit]
An example of the use of ports is the delivery of email. A server used for sending and receiving email generally needs two services. The first service is used to transport email to and from other servers. This is accomplished with the Simple Mail Transfer Protocol (SMTP). A standard SMTP service application listens on TCP port 25 for incoming requests. The second service is usually either the Post Office Protocol (POP) or the Internet Message Access Protocol (IMAP) which is used by email client applications on users’ personal computers to fetch email messages from the server. The POP service listens on TCP port number 110. Both services may be running on the same host computer, in which case the port number distinguishes the service that was requested by a remote computer, be it a user’s computer or another mail server.
While the listening port number of a server is well defined (IANA calls these the well-known ports), the client’s port number is often chosen from the dynamic port range (see below). In some applications, the clients and the server each use specific port numbers assigned by the IANA. A good example of this is DHCP in which the client always uses UDP port 68 and the server always uses UDP port 67.
Use in URLs[edit]
Port numbers are sometimes seen in web or other uniform resource locators (URLs). By default, HTTP uses port 80 and HTTPS uses port 443, but a URL like specifies that the web browser connects instead to port 8080 of the HTTP server.
History[edit]
The concept of port numbers was established by the early developers of the ARPANET in informal cooperation of software authors and system administrators. The term port number was not yet used at this time. It was preceded by the use of the term socket number in the early development stages of the network. A socket number for a remote host was a 40-bit quantity. [4] The first 32 bits were similar to today’s IPv4 address, but at the time the most-significant 8 bits were the host number. The least-significant portion of the socket number (bits 33 through 40) was an entity called Another Eightbit Number, abbreviated AEN. [5] Today, network socket refers to a related but distinct concept, namely the internal address of an endpoint used only within the node.
On March 26, 1972, Vint Cerf and Jon Postel called for documenting the then-current usages and establishing a socket number catalog in RFC 322. Network administrators were asked to submit a note or place a phone call, “describing the function and socket numbers of network service programs at each HOST”. [6] This catalog was subsequently published as RFC 433 in December 1972 and included a list of hosts and their port numbers and the corresponding function used at each host in the network. This first registry function served primarily as documentation of usage and indicated that port number usage was conflicting between some hosts for “useful public services”. [5] The document promised a resolution of the conflicts based on a standard that Postel had published in May 1972 in RFC 349, in which he first proposed official assignments of port numbers to network services and suggested a dedicated administrative function, which he called a czar, to maintain a registry. [7]
The 256 values of the AEN were divided into the following ranges:
AEN ranges
Port number range
0 through 63
Network-wide standard functions
64 through 127
Host-specific functions
128 through 239
Reserved for future use
240 through 255
Any experimental function
The Telnet service received the first official assignment of the value 1.
In detail, the first set of assignments was:[7]
Port assignments in RFC 349
Port number
1
Telnet
3
File transfer
5
Remote job entry
7
Echo
9
Discard
In the early ARPANET, the AEN was also called a socket name, [8] and was used with the Initial Connection Protocol (ICP), a component of the Network Control Program (NCP). [9][10] NCP was the forerunner of the modern Internet protocols. Today the terminology service name is still closely connected with port numbers, the former being text strings used in some network functions to represent a numerical port number.
References[edit]
^ Postel, John. “RFC 793”. Retrieved 29 June 2012.
^ Michelle Cotton; Lars Eggert; et al. (August 2011). Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry. IETF. doi:10. 17487/RFC6335. BCP 165. RFC 6335.
^ “Port Numbers”. Internet Assigned Numbers Authority (IANA).
^ RFC 36, Protocol Notes, S. Crocker (16 March 1970)
^ a b RFC 433, Socket number list, J. Postel, N. Neigus (22 December 1972)
^ RFC 322, Well Known Socket Numbers, V. Cerf, J. Postel (26 March 1972)
^ a b RFC 349, Proposed Standard Socket Numbers J. Postel (30 May 1972)
^ RFC 197, Initial Connection Protocol–Reviewed, A. Shoshani, E. Harslem (14 July 1971)
^ NIC 7104, ARPANET Protocol Handbook
^ Postel, Jon; Feinler, E. (1978). ARPANET Protocol Handbook. Menlo Park, CA: Network Information Center.
What is Difference between IP address and Port Number in …
What is Difference between IP address and Port Number in Networking?
Jim Lewis40. 7k6 gold badges82 silver badges93 bronze badges
asked May 28 ’16 at 7:29
2
IP address is address of the system in the Network.
Port is address of the service within the System.
So IP address + Port defines address of the particular service on the particular system.
answered Jun 8 ’16 at 10:38
Dmitry PorohDmitry Poroh3, 28517 silver badges33 bronze badges
Think about how many application layer protocols exist (HTTP, FTP, DNS, SSH, etc). Now think about how many task/process/programs exist within your device trying to communicate over the internet. Would it be possible just one address, the IP address, to be able to handle all these different assignments and types of protocols alone? The answer is no.
The IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. The port number is used so the data is directed to the correct location within this device.
The IP and the port number form the structure IP:port number, 192. 168. 1. 1:8080 for example, and the port number can hold 65536 numbers, with the following division:
0 to 1023 – Well known port numbers. Only special companies like Apple QuickTime, MSN, SQL Services, Gopher Services and other prominent services have these port numbers.
1024 to 49151 – Registered ports; meaning they can be registered to specific protocols by software corporations.
49152 to 65536 – Dynamic or private ports; meaning that they can be used by just about anybody.
answered Feb 27 ’19 at 16:15
Caio GomesCaio Gomes3986 silver badges15 bronze badges
IP address is use to identify a host or a group of hosts in a network
while port number is used to identify a particular service running in a host
King Midas1, 1634 gold badges24 silver badges44 bronze badges
answered Jan 11 ’18 at 16:03
ebukaebuka612 silver badges2 bronze badges
Port number is used to identify an application/services which you want to talk to on your system. Some predefined ports like 80 = HTTP server, 23 = Telnet.
You identify a host uniquely (globally) by its IP address. So if I ever wanted to access your laptop via telnet then I’d use the IP address given to you by your ISP and the port 23
answered May 28 ’16 at 7:39
Priyansh GoelPriyansh Goel2, 6191 gold badge11 silver badges36 bronze badges
A MAC address is a layer-2 address. It is used by some layer-2 protocols, e. g. ethernet and Wi-Fi. There are 48-bit and 64-bit MAC addresses. Some layer-2 protocols use different addressing.
An IP address is the address of the layer-3 IP protocol. Different layer-3 protocols use different addressing, e. IPv4, IPX, and IPv6 each have different addressing.
A port number is a layer-4 address used by some layer-4 protocols, e. TCP and UDP. Some layer-4 protocols use different addressing, or none at all.
TCP example: RFC 793, TRANSMISSION CONTROL PROTOCOL
Multiplexing:
To allow for many processes within a single Host to use TCP
communication facilities simultaneously, the TCP provides a set of
addresses or ports within each host. Concatenated with the network
and host addresses from the internet communication layer, this forms a
socket. A pair of sockets uniquely identifies each connection. That
is, a socket may be simultaneously used in multiple connections.
You may want to learn more about the network layers.
answered May 28 ’16 at 16:06
Ron MaupinRon Maupin5, 2704 gold badges23 silver badges29 bronze badges
Simply:
A socket is like a telephone (i. e. end to end device for communication)
IP is like your telephone number (i. address of your socket)
Port is like the person you want to talk to (i. the service you want to order from that address)
In networking, generally a socket is (IP+Port)
answered Feb 19 ’19 at 8:19
IP address: Ip address is a address of your system, it assign when your system connects to are two types of ip address available here among first one is dynamic which invokes at your system in online. Second one is static, which assign when your system get in offline.
port address Port address is an Id of server such as your using apache server that get port number default 8080 is id of apache server, If you can change server port number.
answered Sep 28 ’18 at 12:52
IP address is your system domain name or socket address of specific system like 192. 0. 1
but the port number is the number of specific location or folder where to you want to write your file or any file transfer like: 3308
answered May 28 ’16 at 7:34
3
The IP address of your computer (host) is the mix of the network ID of the ISP/any other provider (uniquely provided by the ICANN group) and the host name (provided by the Network administrator). The Network ID is unique for all the network and among two networks, we can have same host names but on the same network, the host names can not be the same. So, this is how the host can be identified on the network and data can be transferred. But on the same host multiple applications will be running and once the data reach to the host, we need an identifier to recognize which application data is this TCP Segment/UDP datagram.
The Port number is 16 bits (possibly 65K application can run) and assigned by the Network operating system when the application process creates the sockets. On the Server side, the port numbers are well defined numbers (HTTP- Port #80, SMTP- Port#25). The port number is transport layer addressing (L4) and goes in the header of TCP/UDP.
zarak2, 7933 gold badges20 silver badges29 bronze badges
answered Feb 27 ’17 at 19:44
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Frequently Asked Questions about port format
What is the format of a port number?
A port number is a 16-bit unsigned integer, thus ranging from 0 to 65535. For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port.
What is IP port format?
The IP and the port number form the structure IP:port number, 192.168. 1.1:8080 for example, and the port number can hold 65536 numbers, with the following division: 0 to 1023 – Well known port numbers.Jan 12, 2018
Why is port 8080 default?
“8080” was chosen since it is “two 80’s”, and also because it is above the restricted well known service port range (ports 1-1023, see below). Its use in a URL requires an explicit “default port override” to request a web browser to connect to port 8080 rather than the http default of port 80.
