Free tools · no signup · nothing logged
IT Ops Tools
Browser-based utilities for the checks IT pros run every day. Everything executes client-side against public APIs (Cloudflare DNS-over-HTTPS, registry RDAP); nothing you enter is stored, logged, or sent to this server.
SPF Policy Tree
Recursively expand an SPF record and count DNS lookups against the 10-lookup limit that silently breaks SPF.
M365 Onboarding Readiness
MX, Autodiscover, SPF, DKIM, DMARC, and Teams records checked in one pass for Microsoft 365 readiness.
JWT Inspector
Decode Entra/OAuth tokens locally: tenant, scopes, roles, expiry. The token never leaves your browser.
DNS Propagation Check
Compare a record across Cloudflare, Google, and Quad9 to confirm propagation or spot a stale cache.
IPv6 Subnet Calculator
128-bit precise: network, first/last, block size, compression, and reverse ip6.arpa.
Pwned Password Checker
Check a password against breach data via k-anonymity. Only 5 hash characters ever leave your browser.
Config Diff & Redactor
Diff two config exports line by line, with optional redaction of GUIDs, IPs, and emails. Fully local.
Hash & Checksum
SHA-256/1/384/512 for a file or text to verify downloads. Runs locally, nothing uploaded.
Email Security Checker
SPF, DMARC, DKIM (33-selector discovery), MX, BIMI, MTA-STS, and TLS-RPT with plain-language fixes.
DNS Lookup
Query any record type: A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, CAA, PTR, and DNSSEC records.
WHOIS / RDAP Lookup
Domain registration and IP ownership data via RDAP, the structured successor to WHOIS.
Internet Speed Test
Download, upload, latency, jitter, and packet loss against Cloudflare's edge, using their open-source engine.
Email Header Analyzer
Paste raw headers: hop-by-hop delivery path with delays, authentication results, and spoofing red flags.
DMARC Report Analyzer
Turn rua aggregate XML into sending sources, pass rates, and reject impact. Reports never leave your browser.
SPF Record Generator
Build a correct SPF record from your senders, with the 10-lookup limit counted for you.
DMARC Record Generator
Build a DMARC record with sane policy progression, reporting addresses, and alignment options.
Subnet Calculator
IPv4 network, broadcast, usable range, host count, and wildcard mask from any IP/CIDR.
Reverse DNS Lookup
PTR records for IPv4 and IPv6 with forward-confirmation (FCrDNS), the check mail servers actually enforce.
IP Location Lookup
Geolocation, ISP, ASN, and timezone for any IP address, with a map and honest accuracy caveats.
What's My IP
Your public IP and connection details, served by this site's own edge. Nothing logged.