developer & internet reference
RefNet – Developer & Internet ReferenceLook up any file, format or protocol.
One connected reference for file extensions, MIME types, HTTP, DNS, ports, TLDs, and the languages that produce them — not nine separate lookup tools.
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File Extensions & Internet Protocol Categories
File Extensions1,281
.json · .pdf · .docx · .zip
MIME Types2,601
application/json · image/jpeg
HTTP Status Codes56
200 · 301 · 404 · 500
HTTP Headers118
Content-Type · Cache-Control
HTTP Methods9
GET · POST · PUT · DELETE
DNS Records97
A · MX · TXT · CNAME
TLDs1,438
.com · .dev · .io · .app
Ports691
443 · 22 · 3306 · 8080
Languages781
TypeScript · Python · Go
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