# Internet service providers

<a class="btn btn-lg btn-default" href="/isp_box_config_fr"> Main configuration box</a>

Here is a non-comprehensive list of internet service providers by countries, wich contains criteria of tolerance to self-hosting.

A "no" may cause problems of the using of your server or may require you to make additional configurations. Status in brackets indicates the default behavior.

A list of French and Belgian ISPs is available on the [french page](/isp_fr).

### USA
| Service provider | Box (modem/router) | uPnP available | Port 25 openable | [Hairpinning](http://en.wikipedia.org/wiki/Hairpinning) | Customizable reverse DNS | Fix IP |
| --- | --- | --- | --- | --- | --- | --- |
| Cox | Multiple | Yes | No. Only for business class customer. | No | No | Yes, as a business class customer |
| Charter | Multiple | Yes | No. Only for business class customer. | No | No | Yes, as a business class customer |
| DSLExtreme | Multiple | Yes | Yes | No | No | Yes, extra charge. |

### Brazil
| Service provider | Box (modem/router) | uPnP available | Port 25 openable | [Hairpinning](http://en.wikipedia.org/wiki/Hairpinning) | Customizable reverse DNS | Fix IP |
| --- | --- | --- | --- | --- | --- | --- |
| Global Village Telecom | Multiple | Yes | No. Only for Fix IP| No | No | Yes, extra charge. |

### Ireland
| Service provider | Box (modem/router) | uPnP available | Port 25 openable | [Hairpinning](http://en.wikipedia.org/wiki/Hairpinning) | Customizable reverse DNS | Fix IP |
| --- | --- | --- | --- | --- | --- | --- |
| Whizzy Internet | Multiple | Yes | Yes| Yes | Yes | Yes |

If you want to add international ISPs information, please do consider [modifying this page](/write_documentation).