Apparatus

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sensors Mode-S transponder

7823A4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-228H · BOEING 737-800

Hex
7823A4
Octal
36021644
Decimal
7,873,444
Country
CN
Tail
B-228H
Type
B738
No current signal · last broadcast 15h ago
Flights observed
169
Distinct callsigns
20
Country
CN
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 7823A4.

Country allocation

The ICAO 24-bit address 7823A4 falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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 20 distinct

Callsign Airline Flights Last seen
EPA6224 - 7 2026-07-12
EPA6321 Shenzhen Donghai Airlines 6 2026-05-30
EPA6218 Shenzhen Donghai Airlines 6 2026-05-30
EPA6390 Shenzhen Donghai Airlines 5 2026-05-25
EPA6279 - 5 2026-07-12
EPA6270 - 5 2026-07-13
EPA6239 - 5 2026-06-22
EPA6225 - 5 2026-07-02
EPA6223 - 5 2026-07-12
EPA6389 Shenzhen Donghai Airlines 4 2026-05-24
EPA6383 Shenzhen Donghai Airlines 4 2026-05-22
EPA6317 - 4 2026-07-10
EPA6276 - 4 2026-07-08
EPA6269 - 4 2026-07-13
EPA6259 Shenzhen Donghai Airlines 4 2026-06-14
EPA6248 - 4 2026-07-04
EPA6247 - 4 2026-07-03
EPA6217 Shenzhen Donghai Airlines 4 2026-05-16
EPA6384 - 3 2026-07-05
EPA6322 Shenzhen Donghai Airlines 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 EPA6270 - Jul 13, 15:05 UTCJul 13, 15:45 UTC40m
2026-07-13 EPA6269 - Jul 13, 05:31 UTCJul 13, 05:40 UTC10m
2026-07-13 EPA6280 - Jul 13, 04:00 UTCJul 13, 04:15 UTC15m
2026-07-12 EPA6279 - Jul 12, 22:55 UTCJul 12, 23:05 UTC10m
2026-07-12 EPA6224 - Jul 12, 15:05 UTCJul 12, 15:20 UTC15m
2026-07-12 EPA6224 - Jul 12, 06:30 UTCJul 12, 10:35 UTC4h 5m
2026-07-12 EPA6223 - Jul 12, 02:25 UTCJul 12, 02:40 UTC15m
2026-07-11 EPA6258 - Jul 11, 16:30 UTCJul 11, 16:55 UTC25m
2026-07-11 EPA6313 - Jul 11, 11:45 UTCJul 11, 12:00 UTC15m
2026-07-11 EPA6303 - Jul 11, 00:40 UTCJul 11, 01:00 UTC20m
2026-07-10 EPA6318 - Jul 10, 16:20 UTCJul 10, 16:40 UTC20m
2026-07-10 EPA6317 - Jul 10, 07:30 UTCJul 10, 07:45 UTC15m
2026-07-09 EPA6257 - Jul 9, 23:45 UTCJul 9, 23:55 UTC10m
2026-07-09 EPA6274 - Jul 9, 18:15 UTCJul 9, 18:30 UTC15m
2026-07-08 EPA6276 - Jul 8, 14:55 UTCJul 8, 15:30 UTC35m
2026-07-06 EPA6327 - Jul 6, 04:35 UTCJul 6, 14:45 UTC10h 10m
2026-07-05 EPA6276 - Jul 5, 15:10 UTCJul 6, 14:45 UTC23h 35m
2026-07-05 EPA6276 - Jul 5, 14:40 UTCJul 6, 04:45 UTC14h 5m
2026-07-05 EPA6315 - Jul 5, 02:25 UTCJul 5, 02:35 UTC10m
2026-07-05 EPA6384 - Jul 5, 00:45 UTCJul 5, 01:05 UTC20m
2026-07-04 EPA6277 - Jul 4, 15:15 UTCJul 4, 15:30 UTC15m
2026-07-04 EPA6248 - Jul 4, 13:15 UTCJul 4, 13:35 UTC20m
2026-07-03 EPA6247 - Jul 3, 22:55 UTCJul 3, 23:10 UTC15m
2026-07-03 EPA6270 - Jul 3, 20:55 UTCJul 3, 21:15 UTC20m
2026-07-03 EPA6280 - Jul 3, 05:10 UTCJul 3, 05:30 UTC20m
2026-07-02 EPA6279 - Jul 2, 23:15 UTCJul 2, 23:25 UTC10m
2026-07-02 EPA6222 - Jul 2, 18:55 UTCJul 2, 19:10 UTC15m
2026-07-02 EPA6221 - Jul 2, 08:20 UTCJul 2, 08:35 UTC15m
2026-07-02 EPA6226 - Jul 2, 06:30 UTCJul 2, 06:41 UTC11m
2026-07-02 EPA6225 - Jul 2, 01:55 UTCJul 2, 02:10 UTC15m
2026-06-27 EPA6315 - Jun 27, 02:09 UTCJun 27, 02:25 UTC15m
2026-06-26 EPA6316 HET → NTG Jun 26, 02:30 UTCJun 26, 14:05 UTC11h 35m
2026-06-25 EPA6316 HET → NTG Jun 25, 13:20 UTCJun 25, 13:35 UTC15m
2026-06-23 EPA6232 - Jun 23, 14:49 UTCJun 23, 15:04 UTC15m
2026-06-23 EPA6231 - Jun 23, 02:20 UTCJun 23, 02:29 UTC10m
2026-06-22 EPA6220 - Jun 22, 23:29 UTCJun 22, 23:45 UTC15m
2026-06-22 EPA6239 - Jun 22, 02:04 UTCJun 22, 02:14 UTC10m
2026-06-21 EPA6262 - Jun 21, 23:30 UTCJun 21, 23:50 UTC20m
2026-06-21 EPA6261 SZX → HAK Jun 21, 14:30 UTCJun 21, 14:40 UTC10m
2026-06-21 EPA6284 SHS → SZX Jun 21, 12:04 UTCJun 21, 12:14 UTC10m
2026-06-21 EPA6283 - Jun 21, 03:14 UTCJun 21, 03:25 UTC10m
2026-06-21 EPA6268 - Jun 21, 01:30 UTCJun 21, 01:55 UTC25m
2026-06-20 EPA6267 - Jun 20, 12:19 UTCJun 20, 12:34 UTC15m
2026-06-20 EPA6248 - Jun 20, 10:04 UTCJun 20, 10:25 UTC20m
2026-06-19 EPA6247 - Jun 19, 23:04 UTCJun 19, 23:19 UTC15m
2026-06-19 EPA6238 NTG → SZX Jun 19, 16:44 UTCJun 19, 17:04 UTC20m
2026-06-14 EPA6260 - Jun 14, 23:10 UTCJun 14, 23:29 UTC20m
2026-06-14 EPA6259 SZX → HAK Jun 14, 15:55 UTCJun 14, 16:05 UTC10m
2026-06-14 EPA6239 - Jun 14, 02:00 UTCJun 14, 02:15 UTC15m
2026-06-13 EPA6259 SZX → HAK Jun 13, 15:50 UTCJun 13, 16:00 UTC10m

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 B-228H page for operator, model, and routing details .

Mode-S 7823A4 frequently asked

What is Mode-S code 7823A4?
7823A4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-228H.
Where is Mode-S 7823A4 registered?
Mode-S code 7823A4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7823A4 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7823A4, octal 36021644, decimal 7,873,444.
What flights does 7823A4 operate?
Mode-S 7823A4 has broadcast 20 distinct callsigns, including EPA6224, EPA6321, EPA6218, EPA6390, EPA6279.