Network & auth

All tools run client-side in your browser unless explicitly marked otherwise. No accounts, no cookies.

DMARC / SPF / DKIM Analyzer

Type a domain (or paste a record) and get every DMARC, SPF or DKIM tag explained, misconfigurations flagged, and the SPF 10-lookup budget counted.

EAP-TLS Readiness Checker

A guided checklist wizard for certificate-based Wi-Fi: client cert, trust chains, server cert and profile settings — encoding the failure modes that cost people days.

Azure Subnet Calculator

CIDR calculator that knows Azure's rules: the 5 reserved addresses per subnet, real usable host counts, and subnet splitting.

Private Endpoint DNS Zones

Pick the Azure services you use and get every privatelink DNS zone your private endpoints need — plus the public zones on-prem DNS must forward. The Microsoft Learn table, as a tool.

DMARC Record Generator

Answer a handful of questions and get a correct DMARC TXT record with the exact host name to create — plus warnings about the options that bite: missing rua, strict alignment, pct with p=none.

dig & nslookup Output Explainer

Paste the raw output of dig, nslookup or Resolve-DnsName and get a clean record table with the problems flagged: CNAME conflicts, duplicate SPF records, deprecated types, zero TTLs.

Verify a domain is correctly delegated to Azure DNS: compares the NS records the world sees against the four name servers assigned to your zone, and catches mixed, stale or recreated-zone delegations.

server probe

DNS Record Lookup

Look up A, AAAA, CNAME, MX, NS, TXT, SOA, SRV or CAA records for any public name — with a clear disclosure: this one queries through our server, because browsers can't speak DNS.