Your .CO.UK domain name must follow these guidelines:
1) CHARACTER LIMIT:
+ Domain name must be at least 6 characters and no more than 64 characters long including the .CO.UK category extension (example: in domain XXXX.co.uk, this limitation relates to the XXXX.co.uk)
2) CHARACTER SET:
+ Domain name can contain only latin letters ( a – z ), numbers ( 0 – 9 ) and hyphens ( – ) or a combination of these. This Character Set is called LDH: Letters, Digits, Hyphens ( a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 – )
+ Note that Domain Names are not case sensitive. This means there will be no distinction made between upper case letters and lower case letters (A = a). We recomend the use of lower case letters always.
+ Special characters (such as !, $, &, “, and so on) are not currently acceptable.
+ IDN (Internationalized domain name) with special characters are not allowed.
3) DOMAIN COMPOSITION:
+ Domain name must start and end with an alphanumeric character, not a hyphen.
+ Domain name can not contain any space.
+ Domain name can not contain a hyphen on the 3rd and 4th position of the third level domain name (www.ab- -cd.co.uk).
+ For the SLDs .CO.UK, a Third Level Domain may not consist of only two letters. For example, an application to register “ie.co.uk,” “-a.co.uk” or “e-.co.uk” would be rejected. For the avoidance of doubt, Third Level Domains containing a letter and a number or two numbers are permitted (“2a.co.uk,” “a2.co.uk,” or “22.co.uk” are acceptable).
+ For the SLDs .CO.UK, a Third Level Domain may not be identical to any existing SLD (as listed in Appendices A, B and C to the Rules), or any SLD under .UK the creation of which has formally been announced by Nominet. For example, an application to register “org.co.uk” or “nhs.co.uk” would be rejected.
+ For the SLDs .CO.UK, a Third Level Domain may not be identical to an existing TLD or any TLD the formal approval of which has been announced by ICANN (or any replacement body which controls the creation of new TLDs). For example, an application to register “uk.co.uk.,” “eu.org.uk,” or “com.co.uk” would be rejected.
Source: www.nic.uk
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