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Port 2157 (xnds)

IANA assigns port 2157 to xnds: Xerox Network Document Scan Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xnds TCP Xerox Network Document Scan Protocol William R Lear -
xnds UDP Xerox Network Document Scan Protocol William R Lear -

Registry dates for this port: registered 2008-03-06.

Check what is listening on port 2157

Linux: is anything listening on TCP 2157?
sudo ss -tlnp 'sport = :2157'
Linux: UDP 2157
sudo ss -ulnp 'sport = :2157'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2157
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2157 '
Windows (Command Prompt)
netstat -ano | findstr :2157
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2157 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2157
From Windows
Test-NetConnection HOST -Port 2157
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2157

Block port 2157 in the firewall

ufw
sudo ufw deny 2157/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2157 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2157 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2157' -Direction Inbound -Protocol TCP -LocalPort 2157 -Action Block
ufw
sudo ufw deny 2157/udp
iptables
sudo iptables -A INPUT -p udp --dport 2157 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2157 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2157' -Direction Inbound -Protocol UDP -LocalPort 2157 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.