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Port 16900 (newbay-snc-mc)

IANA assigns port 16900 to newbay-snc-mc: Newbay Mobile Client Update Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
newbay-snc-mc TCP Newbay Mobile Client Update Service Srinivasa Nayudu -
newbay-snc-mc UDP Newbay Mobile Client Update Service Srinivasa Nayudu -

Registry dates for this port: registered 2009-07-06.

Check what is listening on port 16900

Linux: is anything listening on TCP 16900?
sudo ss -tlnp 'sport = :16900'
Linux: UDP 16900
sudo ss -ulnp 'sport = :16900'
Linux / macOS: which process owns the port
sudo lsof -nP -i :16900
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':16900 '
Windows (Command Prompt)
netstat -ano | findstr :16900
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 16900 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 16900
From Windows
Test-NetConnection HOST -Port 16900
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 16900

Block port 16900 in the firewall

ufw
sudo ufw deny 16900/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 16900 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 16900 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 16900' -Direction Inbound -Protocol TCP -LocalPort 16900 -Action Block
ufw
sudo ufw deny 16900/udp
iptables
sudo iptables -A INPUT -p udp --dport 16900 -j DROP
nftables
sudo nft add rule inet filter input udp dport 16900 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 16900' -Direction Inbound -Protocol UDP -LocalPort 16900 -Action Block

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