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Port 10542 (MOS-aux)

IANA assigns port 10542 to MOS-aux: MOS Low Priority Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
MOS-aux TCP MOS Low Priority Port Eric Thorniley -
MOS-aux UDP MOS Low Priority Port Eric Thorniley -

Registry dates for this port: registered 2007-09-17.

Check what is listening on port 10542

Linux: is anything listening on TCP 10542?
sudo ss -tlnp 'sport = :10542'
Linux: UDP 10542
sudo ss -ulnp 'sport = :10542'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10542
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10542 '
Windows (Command Prompt)
netstat -ano | findstr :10542
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10542 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10542
From Windows
Test-NetConnection HOST -Port 10542
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10542

Block port 10542 in the firewall

ufw
sudo ufw deny 10542/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10542 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10542 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10542' -Direction Inbound -Protocol TCP -LocalPort 10542 -Action Block
ufw
sudo ufw deny 10542/udp
iptables
sudo iptables -A INPUT -p udp --dport 10542 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10542 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10542' -Direction Inbound -Protocol UDP -LocalPort 10542 -Action Block

Related ports

10540MOS-lower10541MOS-upper10543MOS-soap10544MOS-soap-opt

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