Domain name
Valid characters consist of:
- Numbers in the range of 0…9
- Alpha characters in the range of A…Z (upper or lower case)
- dash
- period
- No more than 48 valid ASCII characters
- The first and last character of the Domain Name cannot be a period or a dash
- The last portion of the Domain Name can contain only alpha characters
- The Domain Name cannot contain two periods next to each other
The valid format for the domain name is:
- a.b.c.d
- a.b.c
- a.b
- a
For example, these are legal domain names:
- xyz.xxx.yyy.com
- 123.xxx.yyy.com
- 123.123.123.com
- 123.123.com
These are illegal domain name examples:
- 123.345.789.123
- 1234567890
- 123.
- .467
- 123..com
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