A method of accessing, or facilitating access to, a target entity identified by a number string, in which the domain name system (DNS) of the Internet stores records each associated with a corresponding domain name and holding a uniform resource identifier (URI) of an entity associated with the domain name, each said domain name being related to a respective number string from which it can be derived by a process including parsing at least a portion of the number string into at least a part of said domain name, said method comprising:
- (a) applying, by a computing system, said process to the said number string identifying the target entity to form the related domain name;
- (b) supplying the domain name formed in (a) to the DNS to retrieve the URI held in the corresponding said record, the URI being that of the target entity;
- and
- (c) using the URI retrieved in (b) to access, or facilitate access to, said target entity.