This page gives guidance to CR authors who need to put examples of identifiers or other values in their contributions.
It is important to avoid using identifiers which may be publically assigned or routable.
RFC 2606 section 2 reserves four top level domains for test and documentation purposes:
RFC 2606 section 3 also states that IANA reserves the following second level domain names for example and documentation purposes:
Any of the above domains can be used, although we recommend using the .example.... second level domains.
We don't have a solution here yet. Research notes:
E.g., See "00 44" in GSMA TS.06 annex B, allocated by John Talbot @ TUV SUD.
ETSI TS 123 003 clause 2.2 describes the IMSI as up to 15 digits:
Allocate IMSIs with the leading 5-6 digits per Mobile Country Code (MCC) and Mobile Network Code (MNC). The remaining 9-10 digits of MSIN may be any digits.
Use IPv4 addresses from these prefixes.
Use IPv6 addresses from these prefixes.
For the lower 64 bits of an IPv6 address, if using an modified EUI-64 derived from a MAC address, see EUI-64.
The combination of the MCC and MNC is often referred to as the PLMN, and is used as the first 5-6 digits of an IMSI.
For AU and UK, various "drama"/"fiction" ranges are available - see the references. (For ETSI/3GPP reuse maybe UK is better example than AU).
ITU E.164 doesn't appear to have any reserved dialing codes for test or example purposes, but does give a list of reserved and spare codes.
44 1632 960 xxx
44 20 7946 0xxx
44 7700 900 xxx