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Port 2947 (gpsd)

IANA assigns port 2947 to gpsd: GPS Daemon request/response protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gpsd TCP GPS Daemon request/response protocol Eric S Raymond -
gpsd UDP GPS Daemon request/response protocol Eric S Raymond -

Registry dates for this port: last modified 2010-04-19.

Check what is listening on port 2947

Linux: is anything listening on TCP 2947?
sudo ss -tlnp 'sport = :2947'
Linux: UDP 2947
sudo ss -ulnp 'sport = :2947'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2947
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2947 '
Windows (Command Prompt)
netstat -ano | findstr :2947
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2947 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2947
From Windows
Test-NetConnection HOST -Port 2947
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2947

Block port 2947 in the firewall

ufw
sudo ufw deny 2947/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2947 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2947 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2947' -Direction Inbound -Protocol TCP -LocalPort 2947 -Action Block
ufw
sudo ufw deny 2947/udp
iptables
sudo iptables -A INPUT -p udp --dport 2947 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2947 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2947' -Direction Inbound -Protocol UDP -LocalPort 2947 -Action Block

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