# WHATPORT(2638)

## NAME

port 2638 — SAP SQL Anywhere (Sybase) database server — A SQL Anywhere database engine — the embedded Sybase database inside a lot of shipped software.

Protocol: TCP/UDP  
IANA: sybaseanywhere

## DESCRIPTION

SQL Anywhere's database server binds TCP 2638 by default and also listens on UDP 2638 so clients can find servers by broadcast, including on other subnets. If the port is taken the engine picks another, starting at 49152, so 2638 is the common but not guaranteed case. It usually appears not because someone chose Sybase but because a vendor embedded it — backup products, point-of-sale, MDM and monitoring suites all ship SQL Anywhere underneath.

## EXPOSURE

**Do not expose.** A database engine reachable from the internet is a credential-guessing target, and the UDP side answers discovery probes that tell a scanner the server and database names.

## CHECK

```sh
nc -vz -w 3 TARGET 2638
```

## SEE ALSO

- docs — [SQL Anywhere docs — ServerPort (PORT) protocol option (default 2638)](https://infocenter.sybase.com/help/topic/com.sybase.help.sqlanywhere.12.0.1/dbadmin/serverport-network-conparm.html) (infocenter.sybase.com)
- docs — [SAP SQL Anywhere 17 — Server Database Administration guide](https://help.sap.com/doc/68c565f3ab4f480ea42a59fa2ebd444e/17.0.01/en-US/SQL-Anywhere-Server-Database-Administration-en.pdf) (help.sap.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 2638 (sybaseanywhere)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=2638) (iana.org)

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HTML: <https://whatport.net/2638/> · JSON: <https://whatport.net/2638.json> · full dataset: <https://whatport.net/ports.json>