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Port 1515 (ifor-protocol)

IANA assigns port 1515 to ifor-protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ifor-protocol TCP ifor-protocol Dr R P Alston -
ifor-protocol UDP ifor-protocol Dr R P Alston -

Check what is listening on port 1515

Linux: is anything listening on TCP 1515?
sudo ss -tlnp 'sport = :1515'
Linux: UDP 1515
sudo ss -ulnp 'sport = :1515'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1515
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1515 '
Windows (Command Prompt)
netstat -ano | findstr :1515
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1515 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1515
From Windows
Test-NetConnection HOST -Port 1515
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1515

Block port 1515 in the firewall

ufw
sudo ufw deny 1515/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1515 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1515 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1515' -Direction Inbound -Protocol TCP -LocalPort 1515 -Action Block
ufw
sudo ufw deny 1515/udp
iptables
sudo iptables -A INPUT -p udp --dport 1515 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1515 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1515' -Direction Inbound -Protocol UDP -LocalPort 1515 -Action Block

Related ports

1513fujitsu-dtc1514fujitsu-dtcns1516vpad1517vpac

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