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Port 262 (arcisdms)

IANA assigns port 262 to arcisdms: Arcisdms.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
arcisdms TCP Arcisdms Russell Crook -
arcisdms UDP Arcisdms Russell Crook -

Check what is listening on port 262

Linux: is anything listening on TCP 262?
sudo ss -tlnp 'sport = :262'
Linux: UDP 262
sudo ss -ulnp 'sport = :262'
Linux / macOS: which process owns the port
sudo lsof -nP -i :262
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':262 '
Windows (Command Prompt)
netstat -ano | findstr :262
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 262 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 262
From Windows
Test-NetConnection HOST -Port 262
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 262

Block port 262 in the firewall

ufw
sudo ufw deny 262/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 262 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 262 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 262' -Direction Inbound -Protocol TCP -LocalPort 262 -Action Block
ufw
sudo ufw deny 262/udp
iptables
sudo iptables -A INPUT -p udp --dport 262 -j DROP
nftables
sudo nft add rule inet filter input udp dport 262 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 262' -Direction Inbound -Protocol UDP -LocalPort 262 -Action Block

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