1. Member States shall ensure that the following categories of data are retained under this Directive:

(a) data necessary to trace and identify the source of a communication:

(1) concerning fixed network telephony and mobile telephony:

(i) the calling telephone number;

(ii) the name and address of the subscriber or registered user;

(2) concerning Internet access, Internet e-mail and Internet telephony:

(i) the user ID(s) allocated;

(ii) the user ID and telephone number allocated to any communication entering the public telephone network;

(iii) the name and address of the subscriber or registered user to whom an Internet Protocol (IP) address, user ID or telephone number was allocated at the time of the communication;

(b) data necessary to identify the destination of a communication:

(1) concerning fixed network telephony and mobile telephony: