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Port 152 (bftp)

IANA assigns port 152 to bftp: Background File Transfer Program.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
bftp TCP Background File Transfer Program Annette DeSchon -
bftp UDP Background File Transfer Program Annette DeSchon -

Check what is listening on port 152

Linux: is anything listening on TCP 152?
sudo ss -tlnp 'sport = :152'
Linux: UDP 152
sudo ss -ulnp 'sport = :152'
Linux / macOS: which process owns the port
sudo lsof -nP -i :152
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':152 '
Windows (Command Prompt)
netstat -ano | findstr :152
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 152 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 152
From Windows
Test-NetConnection HOST -Port 152
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 152

Block port 152 in the firewall

ufw
sudo ufw deny 152/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 152 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 152 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 152' -Direction Inbound -Protocol TCP -LocalPort 152 -Action Block
ufw
sudo ufw deny 152/udp
iptables
sudo iptables -A INPUT -p udp --dport 152 -j DROP
nftables
sudo nft add rule inet filter input udp dport 152 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 152' -Direction Inbound -Protocol UDP -LocalPort 152 -Action Block

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