# DNS Translation File

A DNS Translation File consists of a list of [DNS](/glossary/d/dns) name pairs, consisting of a *match* and a *replacement*. When the file is used, the *match* is converted to the *replacement*, which is then passed to the [resolver](/glossary/r/resolver).

Special characters can be used in the match:

^ Character ^ Usage ^
| `?` | Wildcard for a single character. |
| `*` | Wildcard for multiple characters. |
| `#` | Comment. |

**Note:** Wildcards can only be used in the match, not the replacement.

### Example

Example of DNS translation file contents:

```
# Translation File
www.*tester.com www.pure-tester.com
mail?.google.com mail.google.com
```