Check domain name registration
highly recommended paid site
performs advanced Whois searches. Has possibly the best historical records.
Searches by IP. The Iris services visualises links between domains.
highly recommended - free lookup service. Searches by domain, email, name & IP,
historical data available when current info is redacted
Whoisology (paid site) allows you to search for domains by
address, name, phone number etc. Historical records.
allows various fields and keywords to be
investigates a server connected to a
domain. It might do this from a US perspective. Different countries may
connect to different servers
domains owned by the same person
Whoxy great tools
including historical whois
Reverse IP - see what else is on a server!
Domainbigdata (recommended) spyse
and spyonweb and webhosting
Robtex - really useful tool for investigating a domain.
Finds its subdomains etc.
Urlscan.io - recommended, lots of detail
Netcraft report - looks at IP
blocks. Search for a domain, find it, click on "netblock"
Electric - investigate a domain name and its IP address
Historical Domain Records - establish
previous ownership & pre-GDPR
many tools, including finding hidden subdomains - see also
Archive.is lists subdomains with screenshots and history
finds loads of subdomains
Advanced IP tools
recommended. A great all-round IP tool with a handy Chrome extension
Tools finds hidden subdomains. See also
Pentest Google Hacking
- search for
website vulnerabilities via Google
Trace Route - locate a website's server
- dozens of useful lookups all on one
useful tools and it
translates IPv6 into normal IPv5
- paste email headers to investigate
mail servers. See also
- various IP location & whois tools. Sometimes finds details others miss
Another useful IP looker upper -
traces an IP to the user's home
See also Whatismyipaddress
IPlocation geolocates an IP
Regional IP address / domain name authorities
International IPs Find which
regional authority handles IP address allocation for a country.
International bodies that issue country code
domains. If WHOIS fails, go to the source!
See also IANA
authorities for domains that don't have a
country code or standard
top level domain.
Nominet British domain authority who oversee
the .uk domain
The TV Corp. WHOIS for the .tv domain.
See also DotFM WHOIS
for the .fm domain
APNIC IP authority for the
Asia Pacific region.
The IP issuing authority for Europe,
have the best WHOIS lookup for European IP
IP authority for for North America
LACNIC for Latin America & the Caribbean and
AFRINIC for Africa