Apparatus

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sensors Mode-S transponder

7801D4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HSN · AIRBUS A-320

Hex
7801D4
Octal
36000724
Decimal
7,864,788
Country
CN
Tail
B-HSN
Type
A320
No current signal · last broadcast Jul 26, 16:40 UTC
Flights observed
443
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 16:40 UTC

Last known position

Most recent position reported by Mode-S 7801D4.

Country allocation

The ICAO 24-bit address 7801D4 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
HKE717 Hong Kong Express Airways 33 2026-07-21
HKE716 Hong Kong Express Airways 24 2026-07-21
HKE791 Hong Kong Express Airways 21 2026-05-26
HKE747 Hong Kong Express Airways 21 2026-07-25
HKE746 Hong Kong Express Airways 18 2026-07-25
HKE790 Hong Kong Express Airways 16 2026-05-26
HKE212 - 13 2026-07-18
HKE833 - 12 2026-07-11
HKE272 - 11 2026-07-20
HKE845 Hong Kong Express Airways 10 2026-07-24
HKE759 - 10 2026-07-16
HKE213 - 10 2026-07-01
HKE879 - 9 2026-07-12
HKE758 - 9 2026-07-16
HKE541 Hong Kong Express Airways 9 2026-07-19
HKE768 - 8 2026-07-14
HKE540 - 8 2026-07-19
HKE251 - 8 2026-07-12
HKE250 - 8 2026-07-12
HKE832 - 7 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HKE215 WUX → HKG Jul 26, 16:20 UTCJul 26, 16:35 UTC15m
2026-07-26 HKE215 WUX → HKG Jul 26, 14:55 UTCJul 26, 15:45 UTC50m
2026-07-26 HKE214 HKG → WUX Jul 26, 09:10 UTCJul 26, 10:35 UTC1h 25m
2026-07-25 HKE747 PEN → HKG Jul 25, 12:20 UTCJul 25, 12:25 UTC5m
2026-07-25 HKE746 HKG → PEN Jul 25, 07:25 UTCJul 25, 07:40 UTC15m
2026-07-25 HKE746 HKG → PEN Jul 25, 04:25 UTCJul 25, 04:40 UTC15m
2026-07-24 HKE845 OKA → HKG Jul 24, 11:20 UTCJul 24, 12:50 UTC1h 30m
2026-07-24 HKE844 HKG → OKA Jul 24, 06:35 UTCJul 24, 08:45 UTC2h 10m
2026-07-23 HKE215 WUX → HKG Jul 23, 15:25 UTCJul 23, 15:45 UTC20m
2026-07-23 HKE214 HKG → WUX Jul 23, 09:05 UTCJul 23, 10:05 UTC1h 0m
2026-07-23 HKE660 HKG → CJU Jul 23, 01:05 UTCJul 23, 07:35 UTC6h 30m
2026-07-22 HKE215 WUX → HKG Jul 22, 13:25 UTCJul 22, 14:15 UTC50m
2026-07-22 HKE566 HKG → DAD Jul 22, 02:40 UTCJul 22, 02:50 UTC10m
2026-07-21 HKE717 SZB → HKG Jul 21, 08:30 UTCJul 21, 08:50 UTC20m
2026-07-21 HKE717 SZB → HKG Jul 21, 05:10 UTCJul 21, 05:25 UTC15m
2026-07-21 HKE716 HKG → SZB Jul 21, 03:20 UTCJul 21, 03:30 UTC10m
2026-07-21 HKE716 HKG → SZB Jul 21, 00:15 UTCJul 21, 00:30 UTC15m
2026-07-20 HKE272 HKG → HKG Jul 20, 10:25 UTCJul 20, 15:45 UTC5h 20m
2026-07-20 HKE717 SZB → HKG Jul 20, 08:40 UTCJul 20, 08:55 UTC15m
2026-07-20 HKE717 SZB → HKG Jul 20, 05:25 UTCJul 20, 05:35 UTC10m
2026-07-20 HKE716 - Jul 20, 03:55 UTCJul 20, 04:05 UTC10m
2026-07-20 HKE716 - Jul 20, 00:45 UTCJul 20, 01:00 UTC15m
2026-07-19 HKE845 - Jul 19, 11:00 UTCJul 19, 12:40 UTC1h 40m
2026-07-19 HKE844 HKG → OKA Jul 19, 06:40 UTCJul 19, 07:50 UTC1h 10m
2026-07-19 HKE541 HAN → HKG Jul 19, 02:55 UTCJul 19, 04:30 UTC1h 35m
2026-07-19 HKE540 - Jul 19, 00:15 UTCJul 19, 00:30 UTC15m
2026-07-18 HKE212 HKG → HKG Jul 18, 07:05 UTCJul 18, 11:40 UTC4h 35m
2026-07-18 HKE541 HAN → HKG Jul 18, 03:55 UTCJul 18, 04:30 UTC35m
2026-07-18 HKE541 HAN → HKG Jul 18, 02:55 UTCJul 18, 03:05 UTC10m
2026-07-18 HKE540 - Jul 18, 00:00 UTCJul 18, 00:10 UTC10m
2026-07-17 HKE272 HKG → HKG Jul 17, 10:15 UTCJul 17, 15:20 UTC5h 5m
2026-07-17 HKE717 - Jul 17, 08:15 UTCJul 17, 08:45 UTC30m
2026-07-17 HKE717 - Jul 17, 04:59 UTCJul 17, 05:15 UTC15m
2026-07-17 HKE716 - Jul 17, 03:20 UTCJul 17, 03:30 UTC10m
2026-07-17 HKE716 - Jul 17, 00:20 UTCJul 17, 00:35 UTC15m
2026-07-16 HKE759 - Jul 16, 14:00 UTCJul 16, 14:25 UTC25m
2026-07-16 HKE759 - Jul 16, 11:45 UTCJul 16, 11:54 UTC10m
2026-07-16 HKE758 - Jul 16, 09:30 UTCJul 16, 09:55 UTC25m
2026-07-16 HKE758 - Jul 16, 07:15 UTCJul 16, 07:35 UTC20m
2026-07-16 HKE553 - Jul 16, 05:20 UTCJul 16, 05:35 UTC15m
2026-07-16 HKE552 - Jul 16, 01:25 UTCJul 16, 01:35 UTC10m
2026-07-15 HKE212 HKG → HKG Jul 15, 08:20 UTCJul 15, 13:10 UTC4h 50m
2026-07-15 HKE553 - Jul 15, 04:50 UTCJul 15, 05:10 UTC20m
2026-07-15 HKE552 - Jul 15, 00:45 UTCJul 15, 01:00 UTC15m
2026-07-14 HKE769 - Jul 14, 20:45 UTCJul 14, 21:05 UTC20m
2026-07-14 HKE769 - Jul 14, 17:45 UTCJul 14, 17:55 UTC10m
2026-07-14 HKE768 - Jul 14, 15:40 UTCJul 14, 15:55 UTC15m
2026-07-14 HKE768 - Jul 14, 12:45 UTCJul 14, 13:00 UTC15m
2026-07-14 HKE717 - Jul 14, 08:40 UTCJul 14, 09:00 UTC20m
2026-07-14 HKE717 - Jul 14, 05:20 UTCJul 14, 05:35 UTC15m

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

Mode-S 7801D4 frequently asked

What is Mode-S code 7801D4?
7801D4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HSN.
Where is Mode-S 7801D4 registered?
Mode-S code 7801D4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801D4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801D4, octal 36000724, decimal 7,864,788.
What flights does 7801D4 operate?
Mode-S 7801D4 has broadcast 20 distinct callsigns, including HKE717, HKE716, HKE791, HKE747, HKE746.