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IDN stands for "Internationalised Domain Name" — domain names that contain characters beyond the standard a-z, 0-9, or hyphens.
Below are some examples of top-level domains and the characters they support:
.SE
Allowed characters: a-z, å, ä, ö, æ, ø, 0-9, "-"
.EU
Allowed characters: a-z, å, ä, ö, ü, é, 0-9, "-"
.NU
Allowed characters: a-z, å, ä, ö, ü, é, 0-9, "-"
.COM .NET .ORG .BIZ .INFO
Allowed characters: a-z, å, ä, ö, ü, é, 0-9, "-"
.DK
Allowed characters: a-z, å, ä, ö, ü, é, æ, ø, 0-9, "-"
.PL
Allowed characters: a-z, å, ä, ö, ü, é, 0-9, "-"
.ES
Does not support å, ä, or ö.