Repurposing ccTLDs carries structural risk. The British Indian Ocean Territory (.io) faces a sovereignty transfer of the Chagos Islands to Mauritius, raising the possibility that the country code itself could cease to exist.

The precedent of .su (Soviet Union) persisting after dissolution exists, but offers no guarantees. The .io domain, adopted en masse by tech companies, stands at the intersection of geopolitics and technology trends — the most fascinating and most precarious case study in the domain world.

Under ICANN rules, ccTLDs corresponding to country codes removed from the ISO 3166-1 list are subject to retirement after a transition period of up to five years. If the Chagos Islands fully transfer to Mauritian sovereignty and the “IO” code is struck from the ISO standard, the future of .io domains becomes profoundly uncertain.

For projects currently using .io, this is not a question of “if someday” but a matter of planning contingencies now.