Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4081A9

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-HLYH · AIRBUS A-321neo

Hex
4081A9
Octal
20100651
Decimal
4,227,497
Country
GB
Tail
G-HLYH
Type
A21N
Broadcasting now · callsign EXS79VB · 36,000 ft
Flights observed
377
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:05 UTC

Current position

4081A9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4081A9 falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom 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
EXS77AW - 12 2026-07-01
EXS5TR - 12 2026-07-13
EXS5BC - 12 2026-07-01
EXS59ED - 12 2026-07-13
EXS8J - 10 2026-07-11
EXS75JU - 10 2026-07-11
EXS38KN - 9 2026-07-14
EXS93GN - 8 2026-07-07
EXS57N - 8 2026-07-04
EXS21NF - 8 2026-07-04
EXS87RH - 7 2026-06-28
EXS80DZ Jet2.com 7 2026-07-02
EXS64VW Jet2.com 7 2026-04-17
EXS4AN Jet2.com 7 2026-04-17
EXS14AM - 7 2026-07-02
EXS74NW - 6 2026-06-28
EXS17NY - 6 2026-04-16
EXS99AH - 5 2026-07-05
EXS75NE Jet2.com 5 2026-06-18
EXS69DB Jet2.com 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EXS94Y AGP → LPL Jul 26, 17:20 UTCJul 26, 21:05 UTC3h 45m
2026-07-26 EXS48DQ STN → CFU Jul 26, 12:20 UTCJul 26, 15:20 UTC3h 0m
2026-07-26 EXS48CL STN → JTR Jul 26, 08:45 UTCJul 26, 10:40 UTC1h 55m
2026-07-26 EXS47VA DLM → STN Jul 26, 05:15 UTCJul 26, 07:10 UTC1h 56m
2026-07-25 EXS92W STN → BJV Jul 25, 20:45 UTCJul 26, 00:25 UTC3h 40m
2026-07-25 EXS43UN AYT → STN Jul 25, 15:30 UTCJul 25, 18:50 UTC3h 20m
2026-07-25 EXS218D GVA → BRS Jul 25, 10:30 UTCJul 25, 13:40 UTC3h 10m
2026-07-25 EXS67ND BRS → GVA Jul 25, 05:55 UTCJul 25, 08:45 UTC2h 50m
2026-07-24 EXS15WT GRO → STN Jul 24, 16:05 UTCJul 25, 00:35 UTC8h 30m
2026-07-24 EXS9UG ZTH → NCL Jul 24, 10:50 UTCJul 24, 14:10 UTC3h 20m
2026-07-24 EXS25XA STN → STN Jul 24, 05:35 UTCJul 24, 09:05 UTC3h 30m
2026-07-23 EXS6MN STN → JSI Jul 23, 20:20 UTCJul 24, 00:45 UTC4h 25m
2026-07-23 EXS61B STN → CHQ Jul 23, 15:00 UTCJul 23, 18:55 UTC3h 55m
2026-07-23 EXS218D - Jul 23, 10:05 UTCJul 23, 13:20 UTC3h 15m
2026-07-23 EXS67ND - Jul 23, 05:20 UTCJul 23, 08:10 UTC2h 50m
2026-07-22 EXS76MK - Jul 22, 11:20 UTCJul 22, 13:20 UTC2h 0m
2026-07-22 EXS96BL LCA → BRS Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-21 EXS17YP - Jul 21, 13:05 UTCJul 21, 15:20 UTC2h 15m
2026-07-21 EXS7JN ACE → BHX Jul 21, 08:15 UTCJul 21, 10:30 UTC2h 15m
2026-07-20 EXS85BE BHX → HER Jul 20, 22:15 UTCJul 21, 03:00 UTC4h 44m
2026-07-20 EXS74MP - Jul 20, 16:05 UTCJul 20, 20:15 UTC4h 10m
2026-07-20 EXS22EF - Jul 20, 11:20 UTCJul 20, 13:45 UTC2h 25m
2026-07-20 EXS56AM LPA → BHX Jul 20, 06:55 UTCJul 20, 09:10 UTC2h 15m
2026-07-19 EXS15QY - Jul 19, 19:50 UTCJul 20, 00:25 UTC4h 35m
2026-07-19 EXS61AB - Jul 19, 14:10 UTCJul 19, 18:15 UTC4h 5m
2026-07-19 EXS54KM REU → MAN Jul 19, 10:00 UTCJul 19, 12:10 UTC2h 10m
2026-07-19 EXS98UT - Jul 19, 06:55 UTCJul 19, 08:40 UTC1h 45m
2026-07-18 EXS1QR BHX → PMI Jul 18, 22:05 UTCJul 19, 02:00 UTC3h 55m
2026-07-18 EXS1HG ZTH → BHX Jul 18, 17:05 UTCJul 18, 20:50 UTC3h 45m
2026-07-18 EXS48RZ LBA → AGP Jul 18, 11:45 UTCJul 18, 15:25 UTC3h 40m
2026-07-18 EXS1739 - Jul 18, 06:30 UTCJul 18, 09:35 UTC3h 5m
2026-07-17 EXS87ET - Jul 17, 22:25 UTCJul 18, 02:25 UTC4h 0m
2026-07-17 EXS3BD MAN → KGS Jul 17, 17:25 UTCJul 17, 21:05 UTC3h 40m
2026-07-17 EXS9DW - Jul 17, 12:19 UTCJul 17, 15:00 UTC2h 40m
2026-07-17 EXS22WA - Jul 17, 08:00 UTCJul 17, 10:25 UTC2h 25m
2026-07-16 EXS2VM - Jul 16, 22:00 UTCJul 17, 01:59 UTC4h 0m
2026-07-16 EXS907 - Jul 16, 16:40 UTCJul 16, 20:09 UTC3h 30m
2026-07-14 EXS13EV RHO → MAN Jul 14, 22:15 UTCJul 15, 02:30 UTC4h 14m
2026-07-14 EXS72KD MAN → RHO Jul 14, 17:10 UTCJul 14, 20:55 UTC3h 45m
2026-07-14 EXS89GV - Jul 14, 12:20 UTCJul 14, 14:40 UTC2h 20m
2026-07-14 EXS38KN EDI → ALC Jul 14, 06:30 UTCJul 14, 09:25 UTC2h 55m
2026-07-13 EXS38HA EFL → EDI Jul 13, 19:55 UTCJul 13, 23:40 UTC3h 45m
2026-07-13 EXS3929 EDI → EFL Jul 13, 15:20 UTCJul 13, 18:45 UTC3h 25m
2026-07-13 EXS59ED FAO → EDI Jul 13, 10:10 UTCJul 13, 12:55 UTC2h 45m
2026-07-13 EXS5TR - Jul 13, 05:55 UTCJul 13, 08:50 UTC2h 55m
2026-07-12 EXS3922 MLA → EDI Jul 12, 21:00 UTCJul 13, 00:40 UTC3h 40m
2026-07-12 EXS23T - Jul 12, 16:35 UTCJul 12, 19:50 UTC3h 15m
2026-07-12 EXS79E PVK → EDI Jul 12, 10:25 UTCJul 12, 14:01 UTC3h 35m
2026-07-12 EXS49FP - Jul 12, 05:55 UTCJul 12, 09:10 UTC3h 15m
2026-07-11 EXS34DA RHO → EDI Jul 11, 21:00 UTCJul 12, 01:20 UTC4h 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 G-HLYH page for operator, model, and routing details .

Mode-S 4081A9 frequently asked

What is Mode-S code 4081A9?
4081A9 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-HLYH.
Where is Mode-S 4081A9 registered?
Mode-S code 4081A9 is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4081A9 broadcasting right now?
Yes. Mode-S 4081A9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4081A9, octal 20100651, decimal 4,227,497.
What flights does 4081A9 operate?
Mode-S 4081A9 has broadcast 20 distinct callsigns, including EXS77AW, EXS5TR, EXS5BC, EXS59ED, EXS8J.