🧰 Utilities & Lookups

Quick reference tools — subnet math, MAC vendor lookup, whois, and certificate conversion.

🧮 CIDR / Subnet Calculator

IPv4. Enter a network or any host address with a prefix (/0–/32).

🔖 MAC Address (OUI) Vendor Lookup

Only the first 3 bytes (the OUI) are needed.

📖 Whois

Domain registration or IP/ASN ownership.

🔐 SSL Certificate Tools

Convert, inspect and decode certificates (PEM ⇄ DER, CSR/key details, chain builder). Open the Certificate Tools →