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Port 2638 (sybaseanywhere)

IANA assigns port 2638 to sybaseanywhere: Sybase Anywhere.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sybaseanywhere TCP Sybase Anywhere SAP -
sybaseanywhere UDP Sybase Anywhere SAP -

Registry dates for this port: last modified 2021-12-03.

Check what is listening on port 2638

Linux: is anything listening on TCP 2638?
sudo ss -tlnp 'sport = :2638'
Linux: UDP 2638
sudo ss -ulnp 'sport = :2638'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2638
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2638 '
Windows (Command Prompt)
netstat -ano | findstr :2638
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2638 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2638
From Windows
Test-NetConnection HOST -Port 2638
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2638

Block port 2638 in the firewall

ufw
sudo ufw deny 2638/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2638 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2638 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2638' -Direction Inbound -Protocol TCP -LocalPort 2638 -Action Block
ufw
sudo ufw deny 2638/udp
iptables
sudo iptables -A INPUT -p udp --dport 2638 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2638 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2638' -Direction Inbound -Protocol UDP -LocalPort 2638 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.