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About IP (Internet Protocol) Addresses
IP addresses are allocated to companies and ISPs in blocks and
to find out who administers a block of addresses.

About Private address blocks
Email to an IP address, Domain Name Service, DNS lookups,
Reverse lookup, Advanced DNS,
Traceroute, SMTP Relay Verify.

What if the site is being coy and trying to hide their domain name?
 

Most virtual web-hosting companies require customers to have a domain name, but if it's not used anywhere and the website only uses it's IP address to advertise, then it is not easy to be found.

Other times a pool of IP addresses is shared between a number of machines - eg on a dynamic-IP dialup connection your machine will be allocated a different IP address each time you connect.

These addresses are usually written in Dotted Quad notation, as a series of four 8 bit numbers, written in decimal and separated by periods. For example 151.196.75.10

 

Each number
is in the range 0 to 255 - so if you ever see something that looks like an IP address with numbers outside those ranges it's not a real address.

The leftmost number is the most significant and the rightmost the least.

So... 151.196.75.10 and 151.196.75.11 are right next-door to each other whilst 151.196.75.10 and 152.196.75.10 are completely unrelated.

IP Address Nslookup is a tool to find your server IP address. Use windows DOS "Command Prompt" (click Start/Programs/Accessories), when the DOS screen opens, at the prompt enter nslookup followed by the name of the domain.

Example - if your domain is mailsbroadcast.com enter; Nslookup mailsbroadcast.com [enter] to display your domain IP address.

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