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Port 888 (accessbuilder, cddbp)

IANA assigns port 888 to accessbuilder, cddbp: AccessBuilder.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
accessbuilder TCP AccessBuilder Steve Sweeney -
cddbp TCP CD Database Protocol
This entry records an unassigned but widespread use Steve Scherf -
accessbuilder UDP AccessBuilder Steve Sweeney -

Check what is listening on port 888

Linux: is anything listening on TCP 888?
sudo ss -tlnp 'sport = :888'
Linux: UDP 888
sudo ss -ulnp 'sport = :888'
Linux / macOS: which process owns the port
sudo lsof -nP -i :888
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':888 '
Windows (Command Prompt)
netstat -ano | findstr :888
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 888 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 888
From Windows
Test-NetConnection HOST -Port 888
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 888

Block port 888 in the firewall

ufw
sudo ufw deny 888/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 888 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 888' -Direction Inbound -Protocol TCP -LocalPort 888 -Action Block
ufw
sudo ufw deny 888/udp
iptables
sudo iptables -A INPUT -p udp --dport 888 -j DROP
nftables
sudo nft add rule inet filter input udp dport 888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 888' -Direction Inbound -Protocol UDP -LocalPort 888 -Action Block

Related ports

886iclcnet-locate887iclcnet-svinfo, iclcnet_svinfo900omginitialrefs901smpnameres

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