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Port 490 (micom-pfs)

IANA assigns port 490 to micom-pfs.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
micom-pfs TCP micom-pfs David Misunas -
micom-pfs UDP micom-pfs David Misunas -

Check what is listening on port 490

Linux: is anything listening on TCP 490?
sudo ss -tlnp 'sport = :490'
Linux: UDP 490
sudo ss -ulnp 'sport = :490'
Linux / macOS: which process owns the port
sudo lsof -nP -i :490
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':490 '
Windows (Command Prompt)
netstat -ano | findstr :490
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 490 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 490
From Windows
Test-NetConnection HOST -Port 490
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 490

Block port 490 in the firewall

ufw
sudo ufw deny 490/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 490 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 490 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 490' -Direction Inbound -Protocol TCP -LocalPort 490 -Action Block
ufw
sudo ufw deny 490/udp
iptables
sudo iptables -A INPUT -p udp --dport 490 -j DROP
nftables
sudo nft add rule inet filter input udp dport 490 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 490' -Direction Inbound -Protocol UDP -LocalPort 490 -Action Block

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