Apparatus

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sensors Mode-S transponder

7801B1

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HTH · AIRBUS A-321

Hex
7801B1
Octal
36000661
Decimal
7,864,753
Country
CN
Tail
B-HTH
Type
A321
No current signal · last broadcast Jul 26, 16:05 UTC
Flights observed
251
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 16:05 UTC

Last known position

Most recent position reported by Mode-S 7801B1.

Country allocation

The ICAO 24-bit address 7801B1 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
HKE825 Hong Kong Express Airways 29 2026-07-26
HKE563 Hong Kong Express Airways 29 2026-07-26
HKE824 Hong Kong Express Airways 28 2026-07-26
HKE566 Hong Kong Express Airways 28 2026-07-26
HKE639 - 11 2026-07-17
HKE111 - 8 2026-07-09
HKE110 - 8 2026-07-09
HKE638 - 6 2026-07-17
HKE559 - 6 2026-07-04
HKE558 - 6 2026-07-04
HKE227 - 6 2026-07-11
HKE226 - 6 2026-07-16
HKE173 - 6 2026-07-05
HKE172 - 6 2026-07-05
HKE597 - 5 2026-07-15
HKE596 - 5 2026-07-15
HKE701 - 4 2026-06-28
HKE131 Hong Kong Express Airways 4 2026-07-22
HKE130 Hong Kong Express Airways 4 2026-07-22
HKE700 - 3 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HKE825 OKA → HKG Jul 26, 15:30 UTCJul 26, 15:45 UTC15m
2026-07-26 HKE825 OKA → HKG Jul 26, 13:30 UTCJul 26, 14:55 UTC1h 25m
2026-07-26 HKE824 HKG → OKA Jul 26, 10:00 UTCJul 26, 12:00 UTC2h 0m
2026-07-26 HKE563 DAD → HKG Jul 26, 08:30 UTCJul 26, 08:40 UTC10m
2026-07-26 HKE566 HKG → DAD Jul 26, 04:15 UTCJul 26, 04:20 UTC5m
2026-07-25 HKE825 OKA → HKG Jul 25, 14:45 UTCJul 25, 16:00 UTC1h 15m
2026-07-25 HKE825 OKA → HKG Jul 25, 13:50 UTCJul 25, 14:00 UTC10m
2026-07-25 HKE824 HKG → OKA Jul 25, 10:00 UTCJul 25, 11:25 UTC1h 25m
2026-07-25 HKE563 DAD → HKG Jul 25, 06:35 UTCJul 25, 06:50 UTC15m
2026-07-25 HKE566 HKG → DAD Jul 25, 02:30 UTCJul 25, 02:40 UTC10m
2026-07-24 HKE825 OKA → HKG Jul 24, 12:45 UTCJul 24, 13:55 UTC1h 10m
2026-07-24 HKE824 HKG → OKA Jul 24, 08:05 UTCJul 24, 10:20 UTC2h 15m
2026-07-24 HKE563 DAD → HKG Jul 24, 06:15 UTCJul 24, 06:35 UTC20m
2026-07-24 HKE566 HKG → DAD Jul 24, 02:30 UTCJul 24, 02:45 UTC15m
2026-07-23 HKE825 OKA → HKG Jul 23, 12:15 UTCJul 23, 13:40 UTC1h 25m
2026-07-23 HKE824 HKG → OKA Jul 23, 09:55 UTCJul 23, 10:05 UTC10m
2026-07-23 HKE824 HKG → OKA Jul 23, 08:00 UTCJul 23, 09:20 UTC1h 20m
2026-07-23 HKE563 DAD → HKG Jul 23, 06:15 UTCJul 23, 06:30 UTC15m
2026-07-23 HKE566 HKG → DAD Jul 23, 02:30 UTCJul 23, 02:45 UTC15m
2026-07-22 HKE131 KHH → HKG Jul 22, 02:30 UTCJul 22, 03:35 UTC1h 5m
2026-07-22 HKE130 HKG → KHH Jul 22, 00:20 UTCJul 22, 01:25 UTC1h 5m
2026-07-21 HKE825 OKA → HKG Jul 21, 12:25 UTCJul 21, 13:50 UTC1h 25m
2026-07-21 HKE824 HKG → OKA Jul 21, 10:10 UTCJul 21, 10:20 UTC10m
2026-07-21 HKE824 HKG → OKA Jul 21, 08:05 UTCJul 21, 09:35 UTC1h 30m
2026-07-21 HKE563 - Jul 21, 06:20 UTCJul 21, 06:35 UTC15m
2026-07-21 HKE566 HKG → DAD Jul 21, 02:30 UTCJul 21, 02:45 UTC15m
2026-07-20 HKE825 OKA → HKG Jul 20, 11:40 UTCJul 20, 13:35 UTC1h 55m
2026-07-20 HKE824 HKG → OKA Jul 20, 08:05 UTCJul 20, 09:30 UTC1h 25m
2026-07-20 HKE563 - Jul 20, 06:15 UTCJul 20, 06:35 UTC20m
2026-07-20 HKE566 HKG → DAD Jul 20, 02:30 UTCJul 20, 02:45 UTC15m
2026-07-19 HKE113 TPE → HKG Jul 19, 07:25 UTCJul 19, 08:55 UTC1h 30m
2026-07-19 HKE112 HKG → TPE Jul 19, 04:50 UTCJul 19, 06:15 UTC1h 25m
2026-07-19 HKE131 KHH → HKG Jul 19, 02:30 UTCJul 19, 03:35 UTC1h 5m
2026-07-19 HKE130 HKG → KHH Jul 19, 00:25 UTCJul 19, 01:30 UTC1h 5m
2026-07-18 HKE825 - Jul 18, 12:25 UTCJul 18, 13:40 UTC1h 15m
2026-07-18 HKE824 - Jul 18, 10:10 UTCJul 18, 10:20 UTC10m
2026-07-18 HKE824 - Jul 18, 08:10 UTCJul 18, 09:20 UTC1h 10m
2026-07-17 HKE639 - Jul 17, 09:35 UTCJul 17, 12:19 UTC2h 45m
2026-07-17 HKE638 - Jul 17, 05:15 UTCJul 17, 08:15 UTC3h 0m
2026-07-16 HKE226 - Jul 16, 13:00 UTCJul 17, 03:25 UTC14h 25m
2026-07-16 HKE631 ICN → HKG Jul 16, 07:00 UTCJul 16, 10:04 UTC3h 5m
2026-07-16 HKE630 HKG → ICN Jul 16, 02:40 UTCJul 16, 05:55 UTC3h 15m
2026-07-15 HKE597 - Jul 15, 16:00 UTCJul 15, 16:25 UTC25m
2026-07-15 HKE596 - Jul 15, 10:10 UTCJul 15, 10:30 UTC20m
2026-07-14 HKE115 TPE → HKG Jul 14, 10:25 UTCJul 14, 11:45 UTC1h 20m
2026-07-14 HKE114 HKG → TPE Jul 14, 07:20 UTCJul 14, 08:40 UTC1h 20m
2026-07-14 HKE553 - Jul 14, 04:40 UTCJul 14, 04:45 UTC5m
2026-07-14 HKE552 - Jul 14, 00:55 UTCJul 14, 01:10 UTC15m
2026-07-13 HKE825 - Jul 13, 13:30 UTCJul 13, 13:40 UTC10m
2026-07-13 HKE825 - Jul 13, 11:35 UTCJul 13, 12:55 UTC1h 20m

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

Mode-S 7801B1 frequently asked

What is Mode-S code 7801B1?
7801B1 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HTH.
Where is Mode-S 7801B1 registered?
Mode-S code 7801B1 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801B1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801B1, octal 36000661, decimal 7,864,753.
What flights does 7801B1 operate?
Mode-S 7801B1 has broadcast 20 distinct callsigns, including HKE825, HKE563, HKE824, HKE566, HKE639.