Look up TCP/UDP port assignments — 443 HTTPS, 5432 Postgres — with service context. Identify mystery listeners instantly — local reference, free, no signup.
Content reviewed October 2026 · About Toolzum
Look up IP geolocation context — city, region, country, hostname, and ASN/org via ipinfo.io. No blocklist verdicts: abuse and blacklist checks are honest link-outs to AbuseIPDB and VirusTotal. Queried IPs leave the browser by design — live lookup, free, no signup.
Generate random TCP/UDP port numbers from well-known, registered, or dynamic ranges. Useful for network testing, Docker port mapping, and firewall configuration.
Look up live A, AAAA, CNAME, MX, TXT, and NS records via DNS-over-HTTPS. Queries go to Google DNS — results display here.
Convert numbers between binary, octal, decimal, and hex with bitwise views. Read 0xFF as 255 instantly — local math, free, no signup.
Get ISO week numbers for any date — plan sprints and fiscal weeks correctly. Know Week 32 means late July instantly — free, local, no signup.
PostgreSQL by default — seeing it listening means a database accepts connections. Verify it's bound to localhost, not 0.0.0.0, on workstations.
0–1023 well-known (HTTP 80, HTTPS 443, SSH 22) need privileges; 1024–49151 registered (Postgres 5432, Redis 6379); 49152+ ephemeral for outbound.
Check the owning process (netstat/ss) before assuming malware — dev servers, updaters, and sync tools all listen legitimately.
No — lookup runs against a local reference in your browser. Nothing leaves your device.
24 named ports from 20 (FTP Data) to 27017 (MongoDB); the box defaults to 443. Anything below 1 or above 65535 returns Invalid port number (1-65535); categories cut at 1024 (Well-known below) and 49152 (Registered below, Dynamic/Private at and above).
HTTP Status Code Checker
Look up HTTP status codes by number — view description, label, and response class (informational, success, redirect, client error, server error).
MIME Type Finder
Find MIME types for any file extension — and extensions for MIME types. Set correct Content-Type headers fast — local reference, free, no signup.