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Port 1601 (aas)

IANA assigns port 1601 to aas.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
aas TCP aas Bob Beard -
aas UDP aas Bob Beard -

Check what is listening on port 1601

Linux: is anything listening on TCP 1601?
sudo ss -tlnp 'sport = :1601'
Linux: UDP 1601
sudo ss -ulnp 'sport = :1601'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1601
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1601 '
Windows (Command Prompt)
netstat -ano | findstr :1601
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1601 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1601
From Windows
Test-NetConnection HOST -Port 1601
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1601

Block port 1601 in the firewall

ufw
sudo ufw deny 1601/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1601 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1601 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1601' -Direction Inbound -Protocol TCP -LocalPort 1601 -Action Block
ufw
sudo ufw deny 1601/udp
iptables
sudo iptables -A INPUT -p udp --dport 1601 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1601 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1601' -Direction Inbound -Protocol UDP -LocalPort 1601 -Action Block

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