CC Country Code
dig Domain Information Groper, command-line tool for querying DNS
DNS Domain Name System
ENUM Electronic Numbering Mapping
E.164 Format for international telephone numbers (i.e .+467012345)
HLR Home Location Register
MCC Mobile Country Code
MNC Mobile Network Code
MNP Mobile Number Portability
NAPTR Name Authority Pointer - resource record type in the DNS of the internet
MSISDN Telephone number to the SIM card in a mobile phone (i.e. 467012345) The domain used for DNS mapping