# WHATPORT(1455)

## NAME

port 1455 — ESL License Manager — Registered to the ESL License Manager — an EDA-era floating-licence daemon.

Protocol: TCP  
IANA registry

## DESCRIPTION

Port 1455 is registered on TCP and UDP as esl-lm, "ESL License Manager", assigned to Abel Chou. Like most of the 1400–1500 range it comes from the era when every EDA and CAD vendor registered a port for its floating-licence daemon. There is no current public specification, and the product is not something you meet on general-purpose infrastructure; on a scan of an engineering workstation network it would be a licence server, anywhere else it is an unidentified listener.

## EXPOSURE

**Expose with care.** Licence daemons are internal infrastructure and are typically old, unauthenticated C daemons — keep them on the engineering network, not the internet.

## CHECK

```sh
sudo lsof -nP -iTCP:1455 -sTCP:LISTEN
```

## SEE ALSO

- 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)

---

HTML: <https://whatport.net/1455/> · JSON: <https://whatport.net/1455.json> · full dataset: <https://whatport.net/ports.json>