One of the old "raid-*" registrations; almost never seen open.
IANA registers 2013/tcp as raid-am and 2013/udp as raid-cd, part of a block of early raid- names scattered through the 2006 to 2018 range that carry only the description "raid" and no public specification. Nothing in current use implements them. On network gear the port falls inside the Cisco reverse-telnet range, where it would be line 13.
Expose with care
Unidentified listener: fingerprint it before exposing it, and treat any console-like response as management access.
$ nc -vz TARGET 2013Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.