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Internet service providers
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Here is a non-comprehensive list of internet service providers by country, which contains criteria about tolerance to self-hosting.
!!!! For a list of French-speaking countries ISP, check the french version of this page .
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
UK
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
BT Internet
Yes
-
Yes
-
-
No
Virgin Media
Yes
-
-
-
No
No
ZEN Internet
Yes
-
Yes
-
Yes
-
PlusNet
Yes
Yes
Yes
No
Yes, if you raise a ticket
Small one off Charge
Brazil
Service provider
Box (modem/router)
uPnP available
Port 25 openable
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
Customizable reverse DNS
Fix IP
Whizzy Internet
Multiple
Yes
Yes
Yes
Yes
Yes
Canada
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
Telus
Multiple
-
No. Extra charge
-
-
No. Extra charge
TekSavvy
Multiple
-
Yes
No
-
No. Extra charge
Sweden
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
Telia
Multiple
Yes
No. Business only.
Yes
No. Business only.
No. Business only.
Bredbandsbolaget
Multiple
Yes
No. Business only.
Yes
No. Business only.
No. Business only.
Ownit
Multiple
Yes
Yes
N/A?
?
Yes
Ownit reserves port 3 and 4 of their router to TV. With a simple call to their hotline, explaining that you want to selfhost, they can reassign one of the ports to be in bridge mode. It means that your server will have its own public fixed IP address, in addition to the modem's.
Switzerland
Most of non business IP provided by ISP are blacklisted.
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
Sunrise
Multiple
No
Yes
No
-
-
Swisscom
Multiple
No
Yes
No
No
No
VTX
Multiple
No
Yes
No
-
-
South Korea
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
LG U+ (HelloVision)
Multiple
Yes
Yes (Without ISP Router)
No
-
Partial
KT(SkyLife, Qook&Show)
Multiple
Yes
Yes
No
-
Partial
SKT (SK Broadband)
Multiple
Yes
Yes
No
-
Partial
Hungary
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
DIGI Távközlési és Szolgáltató Kft.
Yes
No
No. Business only.
No
No
No. Business only
Finland
Service provider
Box (modem/router)
uPnP available
Port 25 openable
Hairpinning
Customizable reverse DNS
Fix IP
DNA
Multiple
Yes
No 1
Yes
No
No. Only for business.
Elisa
Multiple
Yes
No 1
Yes
Not available for consumers
No. Only for Business.
Telia
Multiple
Yes
No 1
Yes
Not available for consumers
No. Only for Business.
If you want to add international ISPs information, please do consider modifying this page .
Regulations in Finland prohibit the use of Port 25 for consumers. ↩︎