Maritime identification digits


Maritime identification digits are used by radio communication facilities to identify their home country or base area in Digital Selective Calling, Automatic Transmitter Identification System, and Automatic Identification System messages as part of their Maritime Mobile Service Identities. The International Telecommunication Union facilitates the assignment of MIDs to countries. Note that not all countries have MIDs; those without are typically landlocked, with no access to international waters. Sorting MID assignments in numerical order reveals a regional structure, with the first digit:
CountryCodes
Adelie Land 501
401
303
201
605
559
202
603
301
304; 305
701
216
307
608
503
203
423
204
308; 309; 311
408
405
314
206
205
312
610
310
410
720
, Sint Eustatius and Saba - Netherlands 306
478
611
710
378
508
207
633
609
514; 515
613
316
617
319
612
670
725
412; 413; 414
516
523
730
616; 620
615
518
321
619
238
Crozet Archipelago618
323
- Netherlands 306
209; 210; 212
270
445
676
219; 220
621
325
327
735
622
359
631
625
276
624
740
231
520
230
226; 227; 228
546
626
629
213
211; 218
627
236
237; 239; 240; 241
331
330
329
332
745
632
630
750
336
334
477
243
251
419
525
422
425
250
428
247
339
431; 432
438
436
634
Kerguelen Islands635
529
440; 441
447
451
531
275
450
644
636; 637
642
252
277
253
453
274
647
255
655
533
455
649
215; 229; 248; 249; 256
538
347
654
645
345
510
214
254
457
262
348
242
650
506
659
544
459
244; 245; 246
540
512
350
656
657
542
536
257; 258; 259
461
463
511
443
351; 352; 353; 354; 355; 356; 357; 370; 371; 372; 373; 374
553
755
760
548
Pitcairn Island555
261
263
358
466
660
264
273
661
665
341
343
Saint Paul and Amsterdam Islands607
361
375; 376; 377
561
268
668
403
663
279
664
667
563; 564; 565; 566
306
267
278
557
666
601
224; 225
417
638
662
765
669
265; 266
269
468
416
472
674; 677
567
671
570
362
672
271
434
364
572
675
272
470; 471
232; 233; 234; 235
379
338; 366; 367; 368; 369
770
437
576; 577
208
775
574
578
473; 475
678
679

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