Apparatus

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sensors Mode-S transponder

ADD2C4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N990BH · DE HAVILLAND DHC-8-100 Dash 8 · operated by BIG HORN AIRWAYS INC

Hex
ADD2C4
Octal
53351304
Decimal
11,391,684
Country
US
Tail
N990BH
Type
DH8A
No current signal · last broadcast 9h ago
Flights observed
86
Distinct callsigns
3
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S ADD2C4.

Country allocation

The ICAO 24-bit address ADD2C4 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 3 distinct

Callsign Airline Flights Last seen
JPR90 - 67 2026-07-14
N990BH - 2 2026-05-04
BHR90 - 1 2026-04-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JPR90 - Jul 14, 05:00 UTCJul 14, 05:40 UTC40m
2026-07-11 JPR90 - Jul 11, 00:00 UTCJul 11, 00:55 UTC55m
2026-07-10 JPR90 - Jul 10, 22:25 UTCJul 10, 22:50 UTC25m
2026-07-10 JPR90 - Jul 10, 20:45 UTCJul 10, 21:10 UTC25m
2026-07-09 JPR90 - Jul 9, 06:05 UTCJul 9, 07:00 UTC55m
2026-07-09 JPR90 - Jul 9, 00:05 UTCJul 9, 00:45 UTC40m
2026-07-07 JPR90 - Jul 7, 20:00 UTCJul 7, 20:45 UTC45m
2026-07-06 JPR90 - Jul 6, 04:50 UTCJul 6, 05:10 UTC20m
2026-07-06 - - Jul 6, 03:05 UTCJul 6, 03:25 UTC20m
2026-07-06 JPR90 - Jul 6, 00:55 UTCJul 6, 01:15 UTC20m
2026-07-05 JPR90 - Jul 5, 22:35 UTCJul 5, 22:45 UTC10m
2026-07-05 JPR90 - Jul 5, 04:20 UTCJul 5, 05:15 UTC55m
2026-07-04 JPR90 - Jul 4, 20:30 UTCJul 4, 20:55 UTC25m
2026-07-03 JPR90 - Jul 3, 23:15 UTCJul 4, 00:05 UTC50m
2026-07-03 JPR90 - Jul 3, 20:15 UTCJul 3, 21:10 UTC55m
2026-07-02 JPR90 - Jul 2, 23:10 UTCJul 3, 00:05 UTC55m
2026-07-02 JPR90 - Jul 2, 19:55 UTCJul 2, 20:45 UTC50m
2026-07-02 JPR90 - Jul 2, 02:35 UTCJul 2, 03:00 UTC25m
2026-07-02 JPR90 - Jul 2, 00:35 UTCJul 2, 01:00 UTC25m
2026-07-01 JPR90 - Jul 1, 23:20 UTCJul 1, 23:45 UTC25m
2026-07-01 JPR90 - Jul 1, 21:20 UTCJul 1, 21:50 UTC30m
2026-07-01 JPR90 - Jul 1, 02:50 UTCJul 1, 03:15 UTC25m
2026-06-30 - - Jun 30, 23:55 UTCJul 1, 00:10 UTC15m
2026-06-30 JPR90 - Jun 30, 05:45 UTCJun 30, 06:20 UTC35m
2026-06-30 JPR90 - Jun 30, 02:15 UTCJun 30, 02:30 UTC15m
2026-06-29 JPR90 - Jun 29, 23:14 UTCJun 29, 23:54 UTC40m
2026-06-29 - - Jun 29, 19:54 UTCJun 29, 20:44 UTC50m
2026-06-28 JPR90 - Jun 28, 23:44 UTCJun 29, 00:14 UTC30m
2026-06-28 JPR90 - Jun 28, 21:40 UTCJun 28, 22:04 UTC25m
2026-06-28 JPR90 - Jun 28, 03:29 UTCJun 28, 03:40 UTC10m
2026-06-26 JPR90 - Jun 26, 20:50 UTCJun 26, 21:04 UTC15m
2026-06-26 JPR90 - Jun 26, 18:34 UTCJun 26, 18:54 UTC20m
2026-06-24 JPR90 FBK → FBK Jun 24, 20:30 UTCJun 24, 20:54 UTC25m
2026-06-24 JPR90 - Jun 24, 04:24 UTCJun 24, 07:15 UTC2h 50m
2026-06-23 JPR90 - Jun 23, 02:34 UTCJun 23, 02:49 UTC15m
2026-06-23 JPR90 - Jun 23, 00:39 UTCJun 23, 00:54 UTC15m
2026-06-22 JPR90 - Jun 22, 02:00 UTCJun 22, 02:30 UTC30m
2026-06-22 JPR90 - Jun 22, 00:55 UTCJun 22, 01:15 UTC20m
2026-06-21 JPR90 - Jun 21, 06:44 UTCJun 21, 07:00 UTC15m
2026-06-21 JPR90 - Jun 21, 04:34 UTCJun 21, 05:40 UTC1h 5m
2026-06-21 JPR90 - Jun 21, 01:55 UTCJun 21, 02:35 UTC40m
2026-06-18 JPR90 - Jun 18, 00:10 UTCJun 18, 01:25 UTC1h 15m
2026-06-15 - - Jun 15, 19:20 UTCJun 15, 19:39 UTC20m
2026-06-11 JPR90 - Jun 11, 19:05 UTCJun 11, 19:45 UTC40m
2026-06-10 JPR90 - Jun 10, 18:50 UTCJun 10, 19:35 UTC45m
2026-06-07 JPR90 - Jun 7, 20:30 UTCJun 7, 21:05 UTC35m
2026-06-04 JPR90 FBK → FBK Jun 4, 22:20 UTCJun 5, 02:15 UTC3h 55m
2026-06-02 JPR90 FBK → FBK Jun 2, 22:50 UTCJun 2, 23:25 UTC35m
2026-05-28 JPR90 FBK → FBK May 28, 22:35 UTCMay 29, 00:45 UTC2h 10m
2026-05-26 JPR90 FBK → FBK May 26, 19:10 UTCMay 26, 19:45 UTC35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N990BH page for operator, model, and routing details .

Mode-S ADD2C4 frequently asked

What is Mode-S code ADD2C4?
ADD2C4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N990BH.
Where is Mode-S ADD2C4 registered?
Mode-S code ADD2C4 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is ADD2C4 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD2C4, octal 53351304, decimal 11,391,684.
What flights does ADD2C4 operate?
Mode-S ADD2C4 has broadcast 3 distinct callsigns, including JPR90, N990BH, BHR90.