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Port 3953 (xmlink-connect)

IANA assigns port 3953 to xmlink-connect: Eydeas XMLink Connect.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xmlink-connect TCP Eydeas XMLink Connect David Crewson -
xmlink-connect UDP Eydeas XMLink Connect David Crewson -

Registry dates for this port: registered 2004-09.

Check what is listening on port 3953

Linux: is anything listening on TCP 3953?
sudo ss -tlnp 'sport = :3953'
Linux: UDP 3953
sudo ss -ulnp 'sport = :3953'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3953
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3953 '
Windows (Command Prompt)
netstat -ano | findstr :3953
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3953 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3953
From Windows
Test-NetConnection HOST -Port 3953
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3953

Block port 3953 in the firewall

ufw
sudo ufw deny 3953/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3953 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3953 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3953' -Direction Inbound -Protocol TCP -LocalPort 3953 -Action Block
ufw
sudo ufw deny 3953/udp
iptables
sudo iptables -A INPUT -p udp --dport 3953 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3953 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3953' -Direction Inbound -Protocol UDP -LocalPort 3953 -Action Block

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