Telephone numbers in the Cocos Islands use ranges owned by

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. Country Code: +61 8 9162 (partial)
International Call Prefix: 0011
Trunk Prefix: 0 Format +61 8 9162 XXXX Cocos Island numbers formerly used the +672 country code until 1994, when they were migrated to +61.

References

Cocos Islands Cocos (Keeling) Islands {{Telephonenumber-stub