HTTPfy

Port 387 (aurp)

IANA assigns port 387 to aurp: Appletalk Update-Based Routing Pro..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
aurp TCP Appletalk Update-Based Routing Pro. Chris Ranch -
aurp UDP Appletalk Update-Based Routing Pro. Chris Ranch -

Check what is listening on port 387

Linux: is anything listening on TCP 387?
sudo ss -tlnp 'sport = :387'
Linux: UDP 387
sudo ss -ulnp 'sport = :387'
Linux / macOS: which process owns the port
sudo lsof -nP -i :387
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':387 '
Windows (Command Prompt)
netstat -ano | findstr :387
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 387 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 387
From Windows
Test-NetConnection HOST -Port 387
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 387

Block port 387 in the firewall

ufw
sudo ufw deny 387/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 387 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 387 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 387' -Direction Inbound -Protocol TCP -LocalPort 387 -Action Block
ufw
sudo ufw deny 387/udp
iptables
sudo iptables -A INPUT -p udp --dport 387 -j DROP
nftables
sudo nft add rule inet filter input udp dport 387 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 387' -Direction Inbound -Protocol UDP -LocalPort 387 -Action Block

Related ports

385ibm-app386asa388unidata-ldm389LDAP

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