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Port 1971 (netop-school)

IANA assigns port 1971 to netop-school: NetOp School.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netop-school TCP NetOp School NetOp Technical Supp -
netop-school UDP NetOp School NetOp Technical Supp -

Check what is listening on port 1971

Linux: is anything listening on TCP 1971?
sudo ss -tlnp 'sport = :1971'
Linux: UDP 1971
sudo ss -ulnp 'sport = :1971'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1971
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1971 '
Windows (Command Prompt)
netstat -ano | findstr :1971
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1971 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1971
From Windows
Test-NetConnection HOST -Port 1971
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1971

Block port 1971 in the firewall

ufw
sudo ufw deny 1971/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1971 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1971 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1971' -Direction Inbound -Protocol TCP -LocalPort 1971 -Action Block
ufw
sudo ufw deny 1971/udp
iptables
sudo iptables -A INPUT -p udp --dport 1971 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1971 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1971' -Direction Inbound -Protocol UDP -LocalPort 1971 -Action Block

Related ports

1969lipsinc11970netop-rc1972intersys-cache1973dlsrap

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