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Port 3618 (aairnet-1)

IANA assigns port 3618 to aairnet-1: AAIR-Network 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
aairnet-1 TCP AAIR-Network 1 - -
aairnet-1 UDP AAIR-Network 1 - -

Check what is listening on port 3618

Linux: is anything listening on TCP 3618?
sudo ss -tlnp 'sport = :3618'
Linux: UDP 3618
sudo ss -ulnp 'sport = :3618'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3618
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3618 '
Windows (Command Prompt)
netstat -ano | findstr :3618
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3618 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3618
From Windows
Test-NetConnection HOST -Port 3618
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3618

Block port 3618 in the firewall

ufw
sudo ufw deny 3618/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3618 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3618 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3618' -Direction Inbound -Protocol TCP -LocalPort 3618 -Action Block
ufw
sudo ufw deny 3618/udp
iptables
sudo iptables -A INPUT -p udp --dport 3618 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3618 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3618' -Direction Inbound -Protocol UDP -LocalPort 3618 -Action Block

Related ports

3616cd3o-protocol3617sharp-server3619aairnet-23620ep-pcp

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