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Port 1974 (drp)

IANA assigns port 1974 to drp: DRP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
drp TCP DRP Richard Alan Johnson -
drp UDP DRP Richard Alan Johnson -

Check what is listening on port 1974

Linux: is anything listening on TCP 1974?
sudo ss -tlnp 'sport = :1974'
Linux: UDP 1974
sudo ss -ulnp 'sport = :1974'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1974
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1974 '
Windows (Command Prompt)
netstat -ano | findstr :1974
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1974 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1974
From Windows
Test-NetConnection HOST -Port 1974
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1974

Block port 1974 in the firewall

ufw
sudo ufw deny 1974/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1974 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1974 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1974' -Direction Inbound -Protocol TCP -LocalPort 1974 -Action Block
ufw
sudo ufw deny 1974/udp
iptables
sudo iptables -A INPUT -p udp --dport 1974 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1974 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1974' -Direction Inbound -Protocol UDP -LocalPort 1974 -Action Block

Related ports

1972intersys-cache1973dlsrap1975tcoflashagent1976tcoregagent

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.