| Port No | 13 |
| Service Name | daytime |
| RFC Doc | 867 |
| Protocol | UDP |
| Description | daytime - Daytime Responds with the current time of day. The protocol specification doesn't clearly define the format of the data returned, so every machine responds in a slightly different format. This can be used to fingerprint machines. |
| Reference Link | Daytime Protocol: RFC867 |
| Attack |
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