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IP tools
IP Lookup
ASN, ISP, route, reverse DNS and location for any address.
IPv4 Lookup
Details and formats for any IPv4 address.
IPv6 Lookup
Details, expansion and compression for any IPv6 address.
IP Location
Approximate geolocation with sources and accuracy.
IPv6 Test
Does your connection work over IPv4, IPv6 or both?
IP Address Validator
Check whether an address is valid, and what kind of address it is.
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DNS tools
DNS Lookup
A, AAAA, MX, TXT, NS, SOA, CAA and more with TTLs.
Reverse DNS
PTR records with forward confirmation.
DNS Propagation
Compare answers from several public resolvers.
WHOIS / RDAP
Registration data for domains, IP networks and ASNs.
TLS Certificate Check
The certificate a server presents, its chain and expiry.
HTTP Headers
Your request headers, and the response headers of any public URL.
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Network information
ASN Lookup
Holder, registry and every prefix an AS announces.
IP Range to CIDR
Convert an address range into the smallest set of CIDR blocks.
CIDR Calculator
Network, broadcast, masks and host counts for any prefix.
Subnet Calculator
Split networks into subnets, IPv4 and IPv6.
IP Converter
Binary, hex, integer, expanded and reverse forms of an address.
IPv4 to IPv6
IPv4-mapped, 6to4 and NAT64 representations.
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Guides
How it works
Search IPs, domains, ASNs, tools…
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IP Address Lookup
_dmarc.example.com
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_dmarc.example.com has no A or AAAA records.