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Port 147 (iso-ip)

IANA assigns port 147 to iso-ip: ISO-IP.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iso-ip TCP ISO-IP Marshall Rose -
iso-ip UDP ISO-IP Marshall Rose -

Check what is listening on port 147

Linux: is anything listening on TCP 147?
sudo ss -tlnp 'sport = :147'
Linux: UDP 147
sudo ss -ulnp 'sport = :147'
Linux / macOS: which process owns the port
sudo lsof -nP -i :147
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':147 '
Windows (Command Prompt)
netstat -ano | findstr :147
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 147 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 147
From Windows
Test-NetConnection HOST -Port 147
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 147

Block port 147 in the firewall

ufw
sudo ufw deny 147/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 147 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 147 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 147' -Direction Inbound -Protocol TCP -LocalPort 147 -Action Block
ufw
sudo ufw deny 147/udp
iptables
sudo iptables -A INPUT -p udp --dport 147 -j DROP
nftables
sudo nft add rule inet filter input udp dport 147 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 147' -Direction Inbound -Protocol UDP -LocalPort 147 -Action Block

Related ports

145uaac146iso-tp0148jargon149aed-512

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