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Port 4458 (mcp)

IANA assigns port 4458 to mcp: Matrix Configuration Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mcp TCP Matrix Configuration Protocol Tim DeBaillie -
mcp UDP Matrix Configuration Protocol Tim DeBaillie -

Registry dates for this port: registered 2006-12.

Check what is listening on port 4458

Linux: is anything listening on TCP 4458?
sudo ss -tlnp 'sport = :4458'
Linux: UDP 4458
sudo ss -ulnp 'sport = :4458'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4458
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4458 '
Windows (Command Prompt)
netstat -ano | findstr :4458
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4458 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4458
From Windows
Test-NetConnection HOST -Port 4458
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4458

Block port 4458 in the firewall

ufw
sudo ufw deny 4458/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4458 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4458 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4458' -Direction Inbound -Protocol TCP -LocalPort 4458 -Action Block
ufw
sudo ufw deny 4458/udp
iptables
sudo iptables -A INPUT -p udp --dport 4458 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4458 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4458' -Direction Inbound -Protocol UDP -LocalPort 4458 -Action Block

Related ports

4456prchat-server4457prRegister4460NTS-KE (Network Time Security)4480agtp, agtp-quic

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