# WHATPORT(7123)

## NAME

port 7123 — SNIF relay control — Control connection for SNIF, an SNI-based end-to-end TLS forwarding relay.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigned 7123 to VESvault Corp in December 2021 as snif, referencing draft-zubov-snif section 4.3: the TCP port is the SNIF end-to-end TLS relay control connection, and the UDP registration covers the same relay over QUIC. SNIF lets a device behind NAT allocate a public hostname, obtain a publicly trusted certificate for it, and accept inbound TLS connections through a relay that forwards by SNI without ever holding the private key. A connector on the device keeps the control connection to the relay open; the relay is the side that listens on 7123.

## EXPOSURE

**Fine to expose.** A SNIF relay is meant to be publicly reachable, and the design keeps the TLS private key on the end device so the relay only forwards ciphertext.

## CHECK

```sh
nc -vz TARGET 7123
```

## SEE ALSO

- spec — [draft-zubov-snif — SNIF: SNI-based End-to-End TLS Forwarding](https://datatracker.ietf.org/doc/draft-zubov-snif/) (datatracker.ietf.org)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 7123](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=7123) (iana.org)

---

HTML: <https://whatport.net/7123/> · JSON: <https://whatport.net/7123.json> · full dataset: <https://whatport.net/ports.json>