Registered by Data Domain for appliance-to-appliance backup replication; rare on scans.
IANA carries 4126 as ddrepl, the Data Domain Replication Service, registered by Data Domain — now Dell's deduplicating backup appliance line. DD Replicator copies deduplicated backup data between appliances for disaster recovery. Scan data puts the port in the noise, and current Data Domain deployment guides route replication over other ports, so a listener here is worth confirming against the appliance's own configuration rather than assumed.
Do not expose
Backup-appliance replication traffic is a path to an organisation's entire backup corpus; it belongs on a private link or VPN between sites.
$ nc -vz -w 3 TARGET 4126Seen 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.