Call signs may also be issued by a local Antarctic authority (i.e. base commander) who chooses from a block reserved by their national body for that purpose.
[citation needed] The International Telecommunication Union does not assign call letter blocks to Antarctica[5] since there is no single government there which can send delegates to ITU conferences.
[6] In some cases the assignment of call letters is made locally at an Antarctic base and the relevant national body is notified.
The Worldwide Antarctic Program keeps a list of special event call signs issued from various countries at various times.
[7] TM4IPY was issued in 2007 by France to celebrate the International Polar Year as was IA0IPY, IA8IPY, IA7IPY & IP7IPY by Italy, GB4IPY by the United Kingdom, VY0ICE/VE2 in Canada, LZ07IPY in Argentina, EV5IPY in Belarus, CQ4IPY in Portugal, SN0IPY in Poland, YE2IPY in Indonesia, S50IPY in Slovenia, 5D0IPY in Morocco, and others.