Network tools
Professional-grade tools that run on real data. Every result links to the next useful step.
35 tools
- IP LookupASN, ISP, route, reverse DNS and location for any address.
- IPv4 LookupDetails and formats for any IPv4 address.
- IP LocationApproximate geolocation with sources and accuracy.
- IP Address ValidatorIn your browserCheck whether an address is valid, and what kind of address it is.
- Reserved IP RangesIn your browserPrivate, CGNAT, documentation and other special-purpose blocks, with a checker.
- Compare IP AddressesSame subnet, same network, same AS? Two addresses side by side.
- Bulk IP LookupValidate and look up up to 100 addresses at once.
- IPv6 LookupDetails, expansion and compression for any IPv6 address.
- IPv6 TestDoes your connection work over IPv4, IPv6 or both?
- IPv6 Compress & ExpandIn your browserCanonical short form (RFC 5952) and full form of IPv6 addresses.
- IPv4 to IPv6In your browserIPv4-mapped, 6to4 and NAT64 representations.
- DNS LookupA, AAAA, MX, TXT, NS, SOA, CAA and more with TTLs.
- Reverse DNSPTR records with forward confirmation.
- DNS PropagationCompare answers from several public resolvers.
- DNS Record ComparisonCompare the records of two names, type by type.
- DNSSEC CheckDS, DNSKEY and signatures: is the chain of trust intact?
- Email DNS CheckMX, SPF, DMARC, MTA-STS and DKIM records of a domain, explained.
- Public DNS ResolversWell-known public resolvers, their addresses and features, checked live.
- WHOIS / RDAPRegistration data for domains, IP networks and ASNs.
- Latency TestRound-trip time from your browser to our server.
- MAC Address LookupThe vendor a MAC address prefix is registered to (IEEE).
- IP Range to CIDRIn your browserConvert an address range into the smallest set of CIDR blocks.
- ASN LookupHolder, registry and every prefix an AS announces.
- BGP Prefix LookupWho announces a prefix, what covers it and its more-specifics.
- RPKI Route ValidatorIs a route's origin AS authorised by a ROA?
- TLS Certificate CheckThe certificate a server presents, its chain and expiry.
- HTTP HeadersYour request headers, and the response headers of any public URL.
- Security HeadersHSTS, CSP and the other protective headers of a public site.
- Redirect CheckerFollow a URL hop by hop with status codes.
- WebRTC Leak TestIn your browserWhich addresses your browser exposes over WebRTC.
- CIDR CalculatorIn your browserNetwork, broadcast, masks and host counts for any prefix.
- Subnet CalculatorIn your browserSplit networks into subnets, IPv4 and IPv6.
- IP ConverterIn your browserBinary, hex, integer, expanded and reverse forms of an address.
- IP Overlap CheckerIn your browserFind overlapping networks in a list of CIDR blocks.
- User-Agent ParserIn your browserBrowser, engine, operating system and device from a user-agent string.