# WHATPORT(700)

## NAME

port 700 — EPP — Extensible Provisioning Protocol — how domain registrars create and update domains at a registry.

Protocol: TCP  
IANA registry

## DESCRIPTION

EPP (RFC 5730) is the XML request/response protocol registrars use to register, renew, transfer and delete domain names, hosts and contacts at a registry such as Verisign or a ccTLD operator. RFC 5734 defines its TCP transport: each session runs inside TLS on port 700, opens with a greeting, and requires a login command with registrar credentials. Registries restrict it to allowlisted registrar source IPs with client certificates, so it is public-by-design but never open to the world. If you find 700 open, it is a registry, a registrar's test/OT&E endpoint, or an EPP server implementation someone is developing against.

## EXPOSURE

**Expose with care.** Legitimately reachable across the internet, but only ever from allowlisted registrar IPs with mutual TLS — an EPP endpoint accepting arbitrary sources is misconfigured.

## CHECK

```sh
openssl s_client -connect TARGET:700
```

## SEE ALSO

- spec — [RFC 5730 — Extensible Provisioning Protocol (EPP)](https://www.rfc-editor.org/rfc/rfc5730.html) (rfc-editor.org)
- spec — [RFC 5734 — EPP Transport over TCP](https://www.rfc-editor.org/rfc/rfc5734.html) (rfc-editor.org)
- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)

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HTML: <https://whatport.net/700/> · JSON: <https://whatport.net/700.json> · full dataset: <https://whatport.net/ports.json>