This help document describes the ports that CUPS uses so that firewall administrators can allow traffic used for printing.
Ports Used for Printer Sharing
Table 1 lists the ports that are used for IPP printer sharing via CUPS.
See Also
What is an SMB? (Small & Midsize Business)Configuring the SMB printing environmentHow to Turn On or Off File and Printer Sharing in Windows 10Disable File and Print Sharing| (Destination) Port | TCP/UDP | Direction | Description |
|---|---|---|---|
| 53(DNS) | TCP/UDP | OUT | Domain Name System lookups and service registrations. |
| 631(IPP/IPPS) | TCP | IN | Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.) |
| 5353(mDNS) | UDP | IN+OUT | Multicast DNS lookups and service registrations. |
Table 2 lists the ports that are used for SMB (Windows) printer sharing, typically via the Samba software.
| (Destination) Port(s) | TCP/UDP | Direction | Description |
|---|---|---|---|
| 137(WINS) | UDP | IN+OUT | Windows Internet Naming Service (name lookup for SMB printing). |
| 139(SMB) | TCP | IN | Windows SMB printing. |
| 445(SMBDS) | TCP | IN+OUT | Windows SMB Domain Server (authenticated SMB printing). |
Ports Used for Network Printers
Table 3 lists the ports for outgoing network traffic that are used for network printers.
Notes:
- DNS and mDNS are used for all printing protocols except SMB.
- SNMP is used to provide status and supply level information for AppSocket and LPD printers.
| (Destination) Port(s) | TCP/UDP | Description |
|---|---|---|
| 53(DNS) | TCP/UDP | Domain Name System lookups. |
| 137(WINS) | UDP | Windows Internet Naming Service (name lookup for SMB printing). |
| 139(SMB) | TCP | Windows SMB printing. |
| 161(SNMP) | UDP | SNMP browsing (broadcast) and status monitoring (directed to printer IP address). |
| 443(IPPS) | TCP | Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.) |
| 445(SMBDS) | TCP | Windows SMB Domain Server (authenticated SMB printing). |
| 515(LPD) | TCP | Line Printer Daemon (LPD/lpr) print job submission and status monitoring. |
| 631(IPP/IPPS) | TCP | Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.) |
| 5353(mDNS) | UDP | Multicast DNS lookups. |
| 9100-9102 | TCP | Raw print data stream (AppSocket/JetDirect). |
