IP and subnets

IPv4 or IPv6, detected as you type: live bit map, netmask, wildcard, first and last address, and what /31 and /32 really mean.

Split, aggregate, contains, exclude, range to CIDR and CIDR to range.

VLSM allocation from a parent block and a list of sizes, a visual split tree, IPv6 nibble plans and exports for Terraform and routers.

Classification against the special-use registries, normalization, integer and binary forms, PTR name and mapped forms; enrichment on request.

Your public address as our edge sees it, with rDNS, ASN, country, request headers and client hints.

ASN and prefix, RPKI validity, attributed geolocation, abuse contact and rDNS for any address.

An autonomous system at a glance: name, prefixes, peers, RPKI status and PeeringDB presence.

An address against a curated set of public blocklists, with listing evidence and delist links.

Is a common port open on your own public address, seen from our vantage point. Arbitrary targets are not offered.

ICMP and TCP reachability and an MTR-style path from the app host, labelled as one vantage point.