US NAVY using ADS-B code hopping for its P8 over South China Sea

Darren Koch (GFDL 1.2 or GFDL 1.2), via Wikimedia Commons

Recently, I started to detect many P8 Poseidon aircraft above South China Sea, like if a dozen of different P8 were flying in the area each day. The only explanation I see is that they are doing ADS-B code hopping, switching to a new TACTICAL code every few minutes.

Here are the codes I detected so far:

Hex CodeRegistrationAircraftAirline/OperatorCountryFirst Seen (UTC)Last Seen (UTC)CallSign
ae67faTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-01 00:45:482021-04-18 04:31:40
ae68a9TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-17 05:56:502021-04-16 17:37:00
ae67daTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-03-24 18:06:382021-04-14 06:48:13
ae6876TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-22 07:04:292021-04-11 06:10:37
ae67fbTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-03-02 06:02:572021-04-09 05:46:54
ae6784TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:27:472021-04-01 06:24:05
ae67a6TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-03-31 10:22:492021-03-31 10:22:49
ae67a5TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-03 04:25:522021-03-28 05:13:20
ae6886TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-03-28 03:00:002021-03-28 03:00:00
ae67a9TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-10 01:02:152021-03-03 19:49:58
ae67c8TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-02-20 01:35:392021-02-20 01:35:40
ae67deTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-25 03:28:422021-02-09 06:40:30
ae6783TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-01-29 12:17:562021-01-29 12:17:56
ae67bbTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-01-29 11:54:012021-01-29 11:54:01
ae67b9TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-03 04:01:042021-01-21 18:26:22
ae68a8TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-21 06:45:542021-01-18 08:27:50
ae67bcTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-24 02:16:442021-01-16 01:49:33
ae67aeTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2021-01-13 02:37:302021-01-13 02:37:30
ae681bTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-14 01:34:092021-01-12 04:41:43
ae6803TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 00:41:402021-01-11 04:20:00
ae67dfTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-27 10:40:402021-01-10 06:08:25
ae6789TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-01 13:43:222021-01-03 06:27:34
ae682dTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 00:41:522020-12-24 03:20:08
ae6845TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 11:19:302020-12-13 07:17:10
ae6805TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-09 10:47:172020-12-09 10:47:17
ae67d3TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-12-01 20:17:302020-12-01 20:17:30
ae67bdTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-29 12:53:542020-11-29 12:53:54
ae6814TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-29 00:13:072020-11-29 00:13:07
ae6822TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-29 00:08:322020-11-29 00:08:32
ae683dTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-28 11:42:192020-11-28 11:42:19
ae6883TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-27 23:07:112020-11-27 23:07:11
ae6870TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-27 10:47:142020-11-27 10:47:14
ae6848TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 22:06:282020-11-26 22:06:28
ae68a2TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 01:38:292020-11-26 01:38:29
ae6849TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 01:36:052020-11-26 01:36:05
ae687cTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-26 01:33:172020-11-26 01:33:17
ae679dTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-25 11:02:302020-11-25 11:02:30
ae6884TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-25 03:33:082020-11-25 03:33:08
ae6860TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-24 15:10:312020-11-24 15:10:31
ae67e0TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-24 14:56:112020-11-24 14:56:11
ae686aTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:57:542020-11-22 23:57:54
ae6879TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:55:432020-11-22 23:55:43
ae6889TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:54:212020-11-22 23:54:21
ae67b3TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:27:542020-11-22 23:27:54
ae687dTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:27:362020-11-22 23:27:36
ae6850TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 23:27:092020-11-22 23:27:09
ae6854TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 11:44:512020-11-22 11:44:51
ae6809TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 11:43:412020-11-22 11:43:41
ae6793TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 11:42:542020-11-22 11:42:54
ae6807TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 11:32:182020-11-22 11:32:18
ae6819TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-22 05:32:172020-11-22 05:50:07
ae6836TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:43:042020-11-21 22:43:04
ae67c2TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:41:122020-11-21 22:41:12
ae67dcTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:39:452020-11-21 22:39:45
ae6885TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:37:472020-11-21 22:37:47
ae67d6TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:37:262020-11-21 22:37:26
ae6813TACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:37:002020-11-21 22:37:00
ae687eTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:36:502020-11-21 22:36:50
ae689eTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-21 22:36:082020-11-21 22:36:08
ae681fTACTICALTactical Code – Various P8 AircraftUS – NavyUnited States2020-11-20 10:44:542020-11-20 10:44:54

Most of the time, I don’t get a position for these aircraft, as they obviously don’t broadcast it, and they are flying too far offshore which makes it difficult to get a MLAT position, as not many receivers can detect them at the same time.

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