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Domain Names & IP Addresses
(This page was last updated on the 25/08/2025)What Is Your Computer Footprint / IP Address Locators
There is an interesting article about IP Addresses from the Privacy Commissioner of Canada Here.
And for IPv6
Whois Domain Registration Details
Whilst Law Enforcement can still request the WhoIs Registration details, due to the changes brought in with the adoption of the General Data Protection Regulation (GDPR) in May 2018, the publicly available WhoIs Registration Data has been removed by most providers. The best we can currently advise to use is at GoDaddy, who will return the WhoIs Registration details of sites if the registrant is outside of the EU;
For a limited number of reasons you can obtain the withheld non-public data on a .uk domain name by completing the WhoIs Request form from the below link and then emailing it to Nominet Here. They do not charge for this service and aim to respond within a day, however be aware Nominet report that they will notify the registrant of your request and your details;
For a limited number of reasons you can also obtain the withheld non-public data on a .ie domain name, as listed on the below link;
Useful Domain Registration, IP & Network Research Tools
Reverse (Pre-GDPR) Whois Details Linked To Domain Names, Registrants And An E-Mail Addresses
Click Here To Open Multiple Tabs For These Pre-GDPR Searches (you must "Allow Pop-Ups" from this website to fully activate this link)
In certain circumstance it is also possible to obtain a full WhoWas Report from ARIN, for Domains Registered with them;
Google Analytic Linked Searches
Click Here To Open Multiple Tabs For These Google Analytic Linked Searches (you must "Allow Pop-Ups" from this website to fully activate this link)
WhoWas / WhoIs History
Check-Out The WhoWas / WhoIs History Registration Details Of A Domain Name
Other Online Resources To Search & Research Domain Names & IP Addresses
Server Website Contents
Sites Where You Can See What Websites Are Hosted On A Server
The Five Regional Internet Registries
ARIN - American Registry for Internet Numbers
AFRINIC - African Network Information Center
APNIC - Asia Pacific Network Information Centre
LACNIC - Latin American and Caribbean Internet Addresses Registry
RIPE - Reseaux IP Europeans Network Coordination Centre
Internal Network IP Addresses
When tracing an email you need to identify the originating IP Address and then sites like DomainTools & InfoSniper can be used to help show to who & where that IP Address is registered.
The following groups of IP Addresses are the IPv4 address ranges which are reserved for private networks;
10.0.0.0 - 10.255.255.255
169.254.1.0 - 169.254.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
Also the following IPv4 addresses are reserved for localhost communication;
127.0.0.0 - 127.255.255.255
And the following IPv4 addresses which are reserved for IANA Multicast Addressing / Special Use;
224.0.0.0 - 239.255.255.255
MAC Addresses
wintelguy.com - track a MAC Address to an equipment manufacturer
coffer.com - track a MAC Address to an equipment manufacturer
samy.pl - MAC Address information collected by Google, by Streetview cameras etc