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Port 1835 (ardusmul)

IANA assigns port 1835 to ardusmul: ARDUS Multicast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ardusmul TCP ARDUS Multicast Toshikatsu Ito -
ardusmul UDP ARDUS Multicast Toshikatsu Ito -

Check what is listening on port 1835

Linux: is anything listening on TCP 1835?
sudo ss -tlnp 'sport = :1835'
Linux: UDP 1835
sudo ss -ulnp 'sport = :1835'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1835
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1835 '
Windows (Command Prompt)
netstat -ano | findstr :1835
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1835 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1835
From Windows
Test-NetConnection HOST -Port 1835
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1835

Block port 1835 in the firewall

ufw
sudo ufw deny 1835/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1835 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1835 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1835' -Direction Inbound -Protocol TCP -LocalPort 1835 -Action Block
ufw
sudo ufw deny 1835/udp
iptables
sudo iptables -A INPUT -p udp --dport 1835 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1835 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1835' -Direction Inbound -Protocol UDP -LocalPort 1835 -Action Block

Related ports

1833udpradio1834ardusuni1836ste-smsc1837csoft1

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