Port 3637 (scservp)

IANA assigns port 3637 to scservp: Customer Service Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

scservp TCP Customer Service Port Jonathan A Zdziarsk -

scservp UDP Customer Service Port Jonathan A Zdziarsk -

Registry dates for this port: registered 2002-11.

Linux: is anything listening on TCP 3637?

sudo ss -tlnp 'sport = :3637'

Linux: UDP 3637

sudo ss -ulnp 'sport = :3637'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3637

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3637 '

Windows (Command Prompt)

netstat -ano | findstr :3637

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3637 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 3637

From Windows

Test-NetConnection HOST -Port 3637

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3637

ufw

sudo ufw deny 3637/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3637 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3637 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3637' -Direction Inbound -Protocol TCP -LocalPort 3637 -Action Block

ufw

sudo ufw deny 3637/udp

iptables

sudo iptables -A INPUT -p udp --dport 3637 -j DROP

nftables

sudo nft add rule inet filter input udp dport 3637 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 3637' -Direction Inbound -Protocol UDP -LocalPort 3637 -Action Block

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