Apparatus

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sensors Mode-S transponder

78921D

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-LEJ · AIRBUS A-321

Hex
78921D
Octal
36111035
Decimal
7,901,725
Country
CN
Tail
B-LEJ
Type
A321
Broadcasting now · callsign HKE824 · 11,050 ft
Flights observed
324
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 21:15 UTC

Current position

78921D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 78921D 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
HKE111 - 14 2026-07-15
HKE824 Hong Kong Express Airways 12 2026-05-19
HKE639 Hong Kong Express Airways 11 2026-07-20
HKE619 - 11 2026-07-17
HKE110 - 11 2026-07-15
HKE631 Hong Kong Express Airways 10 2026-07-24
HKE630 Hong Kong Express Airways 10 2026-07-24
HKE173 Hong Kong Express Airways 10 2026-07-21
HKE825 Hong Kong Express Airways 9 2026-05-19
HKE703 - 9 2026-07-15
HKE702 - 9 2026-07-15
HKE691 Hong Kong Express Airways 8 2026-05-25
HKE618 Hong Kong Express Airways 8 2026-07-16
HKE172 Hong Kong Express Airways 8 2026-07-21
HKE695 - 7 2026-07-18
HKE690 Hong Kong Express Airways 7 2026-05-25
HKE689 Hong Kong Express Airways 7 2026-07-22
HKE625 Hong Kong Express Airways 7 2026-07-20
HKE596 Hong Kong Express Airways 7 2026-07-21
HKE563 - 6 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HKE629 HND → HKG Jul 26, 20:15 UTCJul 26, 21:15 UTC1h 0m
2026-07-26 HKE628 HKG → HND Jul 26, 14:50 UTCJul 26, 18:40 UTC3h 50m
2026-07-26 HKE669 FUK → HKG Jul 26, 12:45 UTCJul 26, 13:00 UTC15m
2026-07-26 HKE669 FUK → HKG Jul 26, 10:35 UTCJul 26, 12:05 UTC1h 30m
2026-07-26 HKE669 FUK → HKG Jul 26, 09:45 UTCJul 26, 09:55 UTC10m
2026-07-26 HKE668 HKG → FUK Jul 26, 05:20 UTCJul 26, 08:15 UTC2h 56m
2026-07-25 HKE183 RMQ → HKG Jul 25, 13:40 UTCJul 25, 14:55 UTC1h 15m
2026-07-25 HKE182 HKG → RMQ Jul 25, 11:15 UTCJul 25, 12:25 UTC1h 10m
2026-07-25 HKE113 TPE → HKG Jul 25, 07:35 UTCJul 25, 09:30 UTC1h 55m
2026-07-25 HKE112 HKG → TPE Jul 25, 04:50 UTCJul 25, 06:25 UTC1h 35m
2026-07-24 HKE226 HKG → NGB Jul 24, 12:15 UTCJul 25, 03:25 UTC15h 10m
2026-07-24 HKE631 ICN → HKG Jul 24, 06:25 UTCJul 24, 09:35 UTC3h 10m
2026-07-24 HKE630 HKG → ICN Jul 24, 02:15 UTCJul 24, 05:25 UTC3h 10m
2026-07-23 HKE833 TAE → HKG Jul 23, 06:50 UTCJul 23, 09:45 UTC2h 55m
2026-07-23 HKE832 HKG → TAE Jul 23, 05:00 UTCJul 23, 05:25 UTC25m
2026-07-23 HKE832 HKG → TAE Jul 23, 02:25 UTCJul 23, 03:55 UTC1h 30m
2026-07-22 HKE689 KIX → HKG Jul 22, 11:55 UTCJul 22, 15:15 UTC3h 20m
2026-07-21 HKE597 - Jul 21, 14:30 UTCJul 21, 14:40 UTC10m
2026-07-21 HKE596 HKG → PQC Jul 21, 08:20 UTCJul 21, 08:35 UTC15m
2026-07-21 HKE173 RMQ → HKG Jul 21, 06:00 UTCJul 21, 07:05 UTC1h 5m
2026-07-21 HKE172 HKG → RMQ Jul 21, 03:35 UTCJul 21, 04:50 UTC1h 15m
2026-07-20 HKE625 HND → HKG Jul 20, 21:45 UTCJul 21, 01:30 UTC3h 44m
2026-07-20 HKE624 HKG → HND Jul 20, 15:45 UTCJul 20, 19:35 UTC3h 50m
2026-07-20 HKE639 FUK → HKG Jul 20, 09:10 UTCJul 20, 12:00 UTC2h 50m
2026-07-20 HKE638 HKG → FUK Jul 20, 04:40 UTCJul 20, 07:25 UTC2h 45m
2026-07-20 HKE227 - Jul 20, 02:25 UTCJul 20, 03:15 UTC50m
2026-07-19 HKE226 - Jul 19, 12:05 UTCJul 19, 13:40 UTC1h 35m
2026-07-19 HKE631 ICN → HKG Jul 19, 06:45 UTCJul 19, 09:55 UTC3h 10m
2026-07-19 HKE630 HKG → ICN Jul 19, 02:30 UTCJul 19, 05:45 UTC3h 15m
2026-07-18 HKE695 - Jul 18, 11:50 UTCJul 18, 14:35 UTC2h 45m
2026-07-18 HKE694 HKG → FUK Jul 18, 07:35 UTCJul 18, 10:35 UTC3h 0m
2026-07-17 HKE115 - Jul 17, 12:00 UTCJul 17, 13:20 UTC1h 20m
2026-07-17 HKE114 HKG → TPE Jul 17, 08:45 UTCJul 17, 10:10 UTC1h 25m
2026-07-17 HKE619 - Jul 17, 04:14 UTCJul 17, 07:20 UTC3h 5m
2026-07-16 HKE618 HKG → ICN Jul 16, 23:20 UTCJul 17, 02:39 UTC3h 20m
2026-07-16 HKE689 KIX → HKG Jul 16, 12:09 UTCJul 16, 16:00 UTC3h 50m
2026-07-16 HKE688 HKG → KIX Jul 16, 07:30 UTCJul 16, 10:59 UTC3h 30m
2026-07-16 HKE523 - Jul 16, 04:30 UTCJul 16, 04:45 UTC15m
2026-07-16 HKE523 - Jul 16, 02:55 UTCJul 16, 03:50 UTC55m
2026-07-16 HKE522 - Jul 16, 00:15 UTCJul 16, 01:50 UTC1h 35m
2026-07-15 HKE703 - Jul 15, 17:00 UTCJul 15, 17:05 UTC5m
2026-07-15 HKE703 - Jul 15, 14:40 UTCJul 15, 14:55 UTC15m
2026-07-15 HKE702 - Jul 15, 13:05 UTCJul 15, 13:25 UTC20m
2026-07-15 HKE702 - Jul 15, 11:00 UTCJul 15, 11:10 UTC10m
2026-07-15 HKE111 - Jul 15, 07:45 UTCJul 15, 08:00 UTC15m
2026-07-15 HKE111 - Jul 15, 06:35 UTCJul 15, 07:10 UTC35m
2026-07-15 HKE110 - Jul 15, 03:15 UTCJul 15, 04:40 UTC1h 25m
2026-07-14 HKE623 HND → HKG Jul 14, 15:55 UTCJul 14, 19:40 UTC3h 45m
2026-07-14 HKE622 HKG → HND Jul 14, 09:55 UTCJul 14, 14:00 UTC4h 5m
2026-07-14 HKE133 KHH → HKG Jul 14, 07:20 UTCJul 14, 08:30 UTC1h 10m

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-LEJ page for operator, model, and routing details .

Mode-S 78921D frequently asked

What is Mode-S code 78921D?
78921D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-LEJ.
Where is Mode-S 78921D registered?
Mode-S code 78921D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78921D broadcasting right now?
Yes. Mode-S 78921D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78921D, octal 36111035, decimal 7,901,725.
What flights does 78921D operate?
Mode-S 78921D has broadcast 20 distinct callsigns, including HKE111, HKE824, HKE639, HKE619, HKE110.