| Port No | 138 |
| Service Name | NetBIOS DataGram service |
| RFC Doc | 0 |
| Protocol | UDP |
| Description | Network Basic Input DataGram service, used by SMB file and print sharing |
| Reference Link | Port Number:138 Service Name:NetBIOS DataGram service Port:UDP |
| Attack | Firewall port 135 inbound and outbound to prevent attacks and information leakage such as account names and passwords. |
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