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Port 1947 (sentinelsrm)

IANA assigns port 1947 to sentinelsrm: SentinelSRM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sentinelsrm TCP SentinelSRM Michael Zunke 2 -
sentinelsrm UDP SentinelSRM Michael Zunke 2 -

Registry dates for this port: registered 2010-07-23.

Check what is listening on port 1947

Linux: is anything listening on TCP 1947?
sudo ss -tlnp 'sport = :1947'
Linux: UDP 1947
sudo ss -ulnp 'sport = :1947'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1947
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1947 '
Windows (Command Prompt)
netstat -ano | findstr :1947
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1947 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1947
From Windows
Test-NetConnection HOST -Port 1947
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1947

Block port 1947 in the firewall

ufw
sudo ufw deny 1947/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1947 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1947 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1947' -Direction Inbound -Protocol TCP -LocalPort 1947 -Action Block
ufw
sudo ufw deny 1947/udp
iptables
sudo iptables -A INPUT -p udp --dport 1947 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1947 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1947' -Direction Inbound -Protocol UDP -LocalPort 1947 -Action Block

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