{
  "port": 1455,
  "protocol": "tcp",
  "service": "ESL License Manager",
  "oneLiner": "Registered to the ESL License Manager — an EDA-era floating-licence daemon.",
  "whatItIs": "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": {
    "verdict": "careful",
    "note": "Licence daemons are internal infrastructure and are typically old, unauthenticated C daemons — keep them on the engineering network, not the internet."
  },
  "checkCommand": "sudo lsof -nP -iTCP:1455 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml",
      "kind": "iana"
    }
  ]
}