Internet service providers

To find generic instructions on how to configure port forwarding, see Main configuration box

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

USA

Service provider Box (modem/router) uPnP available Port 25 openable 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.
AT&T Multiple Yes No. Only for business class customer. unknown. unknown. unknown.
Xfinity (Comcast) Multiple Yes No. Only for business class customer. unknown. unknown. Yes, as a business class customer

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