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Port 3517 (802-11-iapp)

IANA assigns port 3517 to 802-11-iapp: IEEE 802.11 WLANs WG IAPP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
802-11-iapp TCP IEEE 802.11 WLANs WG IAPP Stuart J Kerry -
802-11-iapp UDP IEEE 802.11 WLANs WG IAPP Stuart J Kerry -

Registry dates for this port: registered 2002-05.

Check what is listening on port 3517

Linux: is anything listening on TCP 3517?
sudo ss -tlnp 'sport = :3517'
Linux: UDP 3517
sudo ss -ulnp 'sport = :3517'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3517
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3517 '
Windows (Command Prompt)
netstat -ano | findstr :3517
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3517 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3517
From Windows
Test-NetConnection HOST -Port 3517
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3517

Block port 3517 in the firewall

ufw
sudo ufw deny 3517/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3517 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3517 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3517' -Direction Inbound -Protocol TCP -LocalPort 3517 -Action Block
ufw
sudo ufw deny 3517/udp
iptables
sudo iptables -A INPUT -p udp --dport 3517 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3517 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3517' -Direction Inbound -Protocol UDP -LocalPort 3517 -Action Block

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