HTTPfy

Port 1972 (intersys-cache)

IANA assigns port 1972 to intersys-cache: Cache.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
intersys-cache TCP Cache Mark Hanson -
intersys-cache UDP Cache Mark Hanson -

Check what is listening on port 1972

Linux: is anything listening on TCP 1972?
sudo ss -tlnp 'sport = :1972'
Linux: UDP 1972
sudo ss -ulnp 'sport = :1972'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1972
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1972 '
Windows (Command Prompt)
netstat -ano | findstr :1972
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1972 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1972
From Windows
Test-NetConnection HOST -Port 1972
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1972

Block port 1972 in the firewall

ufw
sudo ufw deny 1972/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1972 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1972 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1972' -Direction Inbound -Protocol TCP -LocalPort 1972 -Action Block
ufw
sudo ufw deny 1972/udp
iptables
sudo iptables -A INPUT -p udp --dport 1972 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1972 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1972' -Direction Inbound -Protocol UDP -LocalPort 1972 -Action Block

Related ports

1970netop-rc1971netop-school1973dlsrap1974drp

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