WhatsMyIPAddress.co.uk

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What is TCP/IP?

TCP/IP (Transmission Control Protocol/Internet Protocol) is the basic communication language or protocol of the Internet. TCP/IP is a two-layer program. The higher layer, Transmission Control Protocol, manages the assembling of a message into smaller packets, the lower layer, Internet Protocol, handles the address part of each packet.

 

 

What is a port number?

A port number is a way to distinguish one TCP/IP service from another at a given IP address. This way one server machine can provide many different services without conflicts among the incoming and outgoing data. For the TCP/IP services,
a port number is a 16-bit integer (0-65535).

 

 

What is a hostname?

A hostname is a name that identifies an individual machine on a network and is associated with a numeric IP address. Host names consists of two parts, a hostname (nickname) which is an alias to an IP address and a domain name which
is a structured name in a hierarchical namespace called the Domain Name System (DNS). For example host name "www.whatismyipaddress.net" has "www" as its hostname and "whatismyipaddress.net" as its domain name, and might point to the IP address 216.183.222.74.

 

 

What is a domain name?

A domain name is part of the Uniform Resource Locator(URL) that tells a Domain Name System (DNS) server where to forward a request for a Web page. Domain name consists of a suffix that indicates top level domain (TLD) such as net, com, org, ca, jp, etc, and a name defines the entity such as "whatismyipaddress" which is together with the top level forms the second level domain name. A third level can be defined to identify a particular host server such as "www" at the
Internet address (e.g. "www.whatismyipaddress.net").

 

 

What is "nslookup"?

"nslookup" is an Internet utility that you can use to find the IP address of a host name or to find the host name that corresponds to an IP address by sending a domain name query packet to a designated domain name system (DNS) server.
However, it is deprecated now and replaced by "host".

 

 

What is "WHOIS"?

Whois is both a searchable database, which contains information about the owner of any second-level domain names and is managed and maintained by the Registry, as well as a program to perform searching on this database.

 

 

What is "traceroute"?

Traceroute is a program to trace the route of data packets traveling through the internet from the specific host to a particular destination, giving information such as how many hops it takes, the time amount of each hop, where a break in
the routing might be, and what kind of delays there are.

 

 

What is an URL?

A Uniform Resource Locator (URL) is a standard for writing the address of a resource or file on the Internet. The URL has form "protocol://host/localinfo", where protocol to fetch the resource includes e.g. http and ftp, host is specified by host name, and localinfo is usually a file name on the local system.

 

 

What is DNS?

Domain Name Service (DNS) is an Internet service which responsible for maintaining lists that translate domain names which is a meaningful and easy-to-remember name, to IP address which Internet is really based on and vice versa.

 

 

What is a Reciprocal Link?

A reciprocal link, or link exchange, or trade-off link, is basically the process of exchanging links between two or more similar or complementary websites. This concept is a win-win solution for both parties, in which it can be an effective
way of generating targeted traffic as well as higher link popularity in the search engines.

 

 

What is DFS?

In the computer/internet terminology, DFS refers to Microsoft Distributed File System (Dfs) for Windows NT 4.0. It is a network server component for you to find and manage data on your network. Dfs is a means for uniting files on different machines into a single name space. Dfs allows you to build a single, hierarchical view of multiple file servers and file server shares on your network. Instead of seeing a physical network of dozens of file servers, each with a separate directory structure, users will now see a few logical directories that include all of the important file servers and file server shares. Each share appears in the most logical place in the directory, no matter what server it is actually on.

 

 

What is UDP?

UDP (User Datagram Protocol) is a lightweight, connectionless protocol which runs on top of IP networks. It is an alternative to the more heavyweigth Transmission Control Protocol (TCP). Unlike TCP, UDP does not provide the service of dividing a message into packets and reassembling it at the other end. Specifically, it doesn't provide sequencing of the packets that the data arrives in. Hence, UDP does not guarantee reliable communication; the application itself must process any errors and check for reliable delivery.

 

 

What is TTL?

The TTL (Time To Live) determines the maximum amount of time an IP packet may live in the network without reaching its destination. It is effectively a limit on the number of routers an IP packet may pass through before being discarded. Each router that receives a packet subtracts one from the count in the TTL field. When the count reaches zero, the router detecting it discards the packet and sends an Internet Control Message Protocol (ICMP) message back to the originating host.

 

 

What is Subnet?

Subnetting is a technique that allows the network administrator to divide a network into smaller networks by using the same network number assignment. From an IP address, the Internet only reads the Network ID and the routers on the Internet are only concerned with routing the IP packet to the destination router. When the IP packet reaches the external router, which has been configured for subnet routing, it reads the Host ID and calculate Subnet Number (Subnet ID) and Host Number. The router then forwards the packet to appropriate subnet number where it is delivered to the final destination host number. Subnet number and host number are determined using Host ID and Subnet

Mask whose default value is
Class A: 255.0.0.0
Class B: 255.255.0.0
Class C: 255.255.255.0

Any time that the subnet mask is not exactly what we had expect going by the classical Class A/B/C rules above, the network is subnetted.

 

 

How do I find out my DNS servers?

Every domain name is required to have a primary DNS server (only one), and at least one secondary DNS server. The WHOIS database lists all the authoritative DNS servers for your domain. This list gets sent to the root server for your Top
Level Domain (such as .com). Anyone in the world trying to reach your domain will get that list, and go to one of the DNS servers to resolve a subdomain within your domain. So how to find them out? Go to Who Is, enter your domain, press
"Enter". Your DNS servers will be listed in the last part of whois information.

 

 

How can I find out the route from my machine to a given server?

You can use "traceroute" command on unix system or "tracert" on windows. To know the route that takes from your machine to WhatIsMyIPAddress.net, just go to Trace Route, enter your IP address or host name and press enter.

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