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Port 2587 (masc)

IANA assigns port 2587 to masc: MASC.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
masc TCP MASC Pavlin Ivanov Radosl -
masc UDP MASC Pavlin Ivanov Radosl -

Check what is listening on port 2587

Linux: is anything listening on TCP 2587?
sudo ss -tlnp 'sport = :2587'
Linux: UDP 2587
sudo ss -ulnp 'sport = :2587'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2587
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2587 '
Windows (Command Prompt)
netstat -ano | findstr :2587
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2587 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2587
From Windows
Test-NetConnection HOST -Port 2587
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2587

Block port 2587 in the firewall

ufw
sudo ufw deny 2587/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2587 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2587 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2587' -Direction Inbound -Protocol TCP -LocalPort 2587 -Action Block
ufw
sudo ufw deny 2587/udp
iptables
sudo iptables -A INPUT -p udp --dport 2587 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2587 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2587' -Direction Inbound -Protocol UDP -LocalPort 2587 -Action Block

Related ports

2585netx-server2586netx-agent2588privilege2589quartus-tcl

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