IP & Network Tools
IP and network tools for site owners and server admins, to find your own public address, trace an IP from your logs to its owner, test whether a server and its ports answer, and do subnet maths without paper.
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IP & Network Tools: all 11 tools
Your IP and who owns an address
What Is My IP shows the public IPv4 or IPv6 address websites see as soon as the page opens, with your provider, AS number, reverse DNS and browser details. IP WHOIS Lookup finds the organization, network range and abuse contact behind any public address, straight from the regional registry, and ASN Lookup shows a network's registration and the IPv4 and IPv6 prefixes it announces. IP Location Lookup, for country, region and city, is coming soon.
Is the server reachable
Ping Test times TCP connections from our server to port 443, 80 or another common port, 4, 6 or 8 times, and reports the fastest, average and slowest time and any losses. Open Port Checker tests up to 10 ports at once and flags databases, Redis or Remote Desktop left open to the internet. IPv6 Support Checker looks at AAAA records, an IPv6 connection, and IPv6 on your name and mail servers.
Calculators in your browser
IP Subnet Calculator works out network, broadcast, host range and masks for IPv4 and IPv6, and splits a range into smaller subnets. IP Address Converter switches an address between dotted, integer, hex, octal, binary and IPv6 forms. User Agent Parser reads browser, system, device, in-app browsers and crawlers from one string or a whole list. MAC Address Vendor Lookup is coming soon.
Free, with fair limits
Lookups run on our server when you click, connect only to public internet addresses and don't store results. They don't use your daily tasks. Instead, each visitor has an hourly allowance, higher once you sign in and much higher with VIP. The three calculators run entirely in your browser, upload nothing and keep working offline.