routing.pl
PLEN

Routing

Addressing

Subnets, VLSM, route aggregation and IPv6 addresses.

IPv4 subnet calculator

local

Calculator, splitting, VLSM, route aggregation and conversions.

IPv6 subnet calculator

local

Address compression, /64 splitting, EUI-64 and a ULA generator.

Domains and certificates

DNS, e-mail, TLS certificates and address reputation.

DNS lookup

API

Query several resolvers at once, with DNSSEC status.

SSL/TLS checker

server

Certificate, chain, expiry and supported protocols.

DNSBL blacklist check

server

Is an IP address or domain listed on spam blocklists.

E-mail: SPF, DKIM, DMARC

API

Check whether a domain has MX, SPF, DKIM, DMARC and MTA-STS set up correctly.

Internet

Your address, prefix owner and BGP routes.

What is my IP

API

IPv4 and IPv6 address, reverse DNS, location and provider.

Whois and ASN lookup

API

Owner of an address or AS, prefix, country and registry records.

BGP looking glass

API

AS paths from RIPE RIS collectors and RPKI validation.

Server-side diagnostics

Tests that a server has to run, not the browser.

Port checker

server

Which ports of a host are reachable from the Internet, rate limited.

Traceroute

server

Packet path from the server to a target with per-hop latency.

MTU and MSS

server

Path MTU discovery and tunnel overhead (PPPoE, WireGuard, VXLAN).