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Port 46 (mpm-snd)

IANA assigns port 46 to mpm-snd: MPM [default send].

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
mpm-snd TCP MPM [default send] Jon Postel -
mpm-snd UDP MPM [default send] Jon Postel -

Check what is listening on port 46

Linux: is anything listening on TCP 46?
sudo ss -tlnp 'sport = :46'
Linux: UDP 46
sudo ss -ulnp 'sport = :46'
Linux / macOS: which process owns the port
sudo lsof -nP -i :46
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':46 '
Windows (Command Prompt)
netstat -ano | findstr :46
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 46 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 46
From Windows
Test-NetConnection HOST -Port 46
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 46

Block port 46 in the firewall

ufw
sudo ufw deny 46/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 46 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 46 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 46' -Direction Inbound -Protocol TCP -LocalPort 46 -Action Block
ufw
sudo ufw deny 46/udp
iptables
sudo iptables -A INPUT -p udp --dport 46 -j DROP
nftables
sudo nft add rule inet filter input udp dport 46 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 46' -Direction Inbound -Protocol UDP -LocalPort 46 -Action Block

Related ports

44mpm-flags45mpm48auditd49TACACS+

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