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Port 1674 (proshare-mc-2)

IANA assigns port 1674 to proshare-mc-2: Intel Proshare Multicast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
proshare-mc-2 TCP Intel Proshare Multicast Mark Lewis -
proshare-mc-2 UDP Intel Proshare Multicast Mark Lewis -

Check what is listening on port 1674

Linux: is anything listening on TCP 1674?
sudo ss -tlnp 'sport = :1674'
Linux: UDP 1674
sudo ss -ulnp 'sport = :1674'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1674
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1674 '
Windows (Command Prompt)
netstat -ano | findstr :1674
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1674 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1674
From Windows
Test-NetConnection HOST -Port 1674
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1674

Block port 1674 in the firewall

ufw
sudo ufw deny 1674/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1674 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1674 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1674' -Direction Inbound -Protocol TCP -LocalPort 1674 -Action Block
ufw
sudo ufw deny 1674/udp
iptables
sudo iptables -A INPUT -p udp --dport 1674 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1674 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1674' -Direction Inbound -Protocol UDP -LocalPort 1674 -Action Block

Related ports

1672netview-aix-121673proshare-mc-11675pdp1676netcomm1, netcomm2

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