Tcpiputils.com provides the ultimate online investigation tool. See detailed information about every IP address, domain name and provider. Perform network tests like DNS lookup, email testing and WHOIS lookup.

Research Tools

• AS/ISP Research - This worldwide ASN report shows detailed information like IPv4 and IPv6 Prefixes, IPv4 and IPv6 Peers, whois information and hosted domains for every AS/ISP. It is grouped by country and sorted by number of ASNs by country.
• Domain/TLD Research - This worldwide TLD report shows detailed information like top domains, whois information and root DNS servers for every TLD.
• IPv4 Research - This worldwide IPv4 address space report enables you to browse the IPv4 address space and see the geolocation, DNS, whois, routing, hosting, domain neighbors, DNSBL, BGP and AS information of every IPv4 subnet and IPv4 address.
• IPv6 Research - This worldwide IPv6 address space report enables you to browse the IPv6 address space and see the geolocation, DNS, whois, routing, hosting, domain neighbors, DNSBL, BGP and AS information of every IPv6 subnet and IPv6 address.

Addons & Apps

• Browser Extensions & Addons - Software to access our data and tools directly from your favorite browser. Extensions and Addons for Chrome, Firefox, Opera, Safara and Internet Explorer.
• Windows Apps - Windows Store App that displays your IP Address information directly inside Windows 8.1 & Windows 10

Email & DNS Tools

• DNS Lookup
• DNS Blackhole List
• Email Test
• SPF Lookup

Network Tools

• IP Geo Lookup
• Mac Address Lookup
• Ping
• Port Scan
• TCP Ping
• Traceroute
• Whois Lookup

Premium Tools

• IP/DNS History
• IP Neighbours
• MX Neighbours
• NS Neighbours
• Reverse SSL

SEO Tools

• Domain Search
• Domain Neighbours
• Reverse Tinyurl