---
id: "port-43"
kind: "glossary-term"
title: "port 43"
language: "en"
category: "Registration data and privacy"
updated: "2026-10-10T09:09:47Z"
canonical: "https://tldlog.com/glossary/port-43/"
translations:
  es: "https://tldlog.com/es/glosario/puerto-43/"
  de: "https://tldlog.com/de/glossar/port-43/"
  fr: "https://tldlog.com/fr/glossaire/port-43/"
  it: "https://tldlog.com/it/glossario/porta-43/"
  pt-BR: "https://tldlog.com/pt/glossario/porta-43/"
  ru: "https://tldlog.com/ru/glossariy/port-43/"
  zh-Hans: "https://tldlog.com/zh/cihui/43-duankou/"
---

# port 43

The network port used by the original WHOIS protocol. A program connects to a server on this port, sends a domain name and gets back plain text. Since 28 January 2025, gTLD registries and registrars no longer have to run it, except for .com, .name and .post, though many ccTLDs still do.

## related terms

- [WHOIS](https://tldlog.com/glossary/whois/)
- [RDAP](https://tldlog.com/glossary/rdap/)
- [RDDS](https://tldlog.com/glossary/rdds/)
- [WHOIS sunset](https://tldlog.com/glossary/whois-sunset/)