Look up anything on the Internet

Search an AS number, IP address, prefix, MAC address, as-set or network name. Every answer is a page that links to the next: who announces it, what RPKI and the IRR say about it, how it is reached, and who it belongs to.

Why this exists

I spend my days in a NOC, and I kept hitting the same wall: the tools I needed were either buried behind unusably low rate limits, hidden behind a login, or had quietly swapped a free tier for a pricing page. I didn’t like the tools that existed, so I made my own.

No accounts, no limits you’ll realistically hit. Just the things I reach for during an incident, built to be fast and to stay out of the way. More will land here over time.

Tools

The looking glass, tests that run from our servers, and the API behind the lookups.

JSON API public endpointBrowser only use the pageRuns locally nothing leaves your browser

Looking Glass

Live BGP

BGP Looking GlassBrowser onlyCompare AS paths, next hops and communities across every peer.

Paths, next hops and communities from our own BGP collectors, checked against RPKI, ASPA and the IRR on every path.

Utilities

6 tools

DNS LookupBrowser onlyTrace a name from the root down, or run a full domain health check.SMTP TLS TestBrowser onlyFind the MX hosts, negotiate STARTTLS and see the whole transaction.Website SSL TestBrowser onlyCertificate, protocol support and cipher strength, graded in plain English.STIR/SHAKEN Certificate TestBrowser onlyPaste an x5u URL: the signing certificate, its SPC, the chain to the STI-PA roots, revocation and fetch time.JSON FormatterRuns locallyValidate, pretty-print or minify JSON, with a collapsible tree view.XML FormatterRuns locallyValidate, pretty-print or minify XML, with a collapsible tree view.

API

6 endpoints

IP → ASN LookupJSON APILongest-prefix match against a live BGP table, plus the owner’s WHOIS.ASN LookupJSON APIRegistrant details and every prefix an AS originates right now.RPKI ValidatorJSON APIIs this AS allowed to originate this prefix? Checked against all five RIRs.ASPA ValidatorJSON APIIs this AS path valley-free? Every hop checked against published provider authorizations.IRR ValidatorJSON APIRoute objects, as-sets and maintainers across every mirrored registry.MAC Address LookupJSON APIFind the vendor for a full or partial MAC from the IEEE registries.

All six answer JSON at api.notoolkit.com/v1/, with no key and no rate limits you’ll ever reasonably hit. Read the API guide.