Apparatus

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sensors Mode-S transponder

4078A4

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-POLW · PARTENAVIA P-68 Observer

Hex
4078A4
Octal
20074244
Decimal
4,225,188
Country
GB
Tail
G-POLW
Type
P68
No current signal · last broadcast 2d ago
Flights observed
43
Distinct callsigns
1
Country
GB
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4078A4.

Country allocation

The ICAO 24-bit address 4078A4 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 1 distinct

Callsign Airline Flights Last seen
UKP154 - 43 2026-07-15

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-15 UKP154 EMA → EMA Jul 15, 16:20 UTCJul 15, 19:05 UTC2h 45m
2026-07-14 UKP154 EMA → EMA Jul 14, 16:50 UTCJul 14, 17:50 UTC1h 0m
2026-07-12 UKP154 CWL → EMA Jul 12, 18:10 UTCJul 12, 20:30 UTC2h 20m
2026-07-12 UKP154 - Jul 12, 15:55 UTCJul 12, 17:40 UTC1h 45m
2026-07-12 UKP154 EMA → CWL Jul 12, 12:15 UTCJul 12, 15:10 UTC2h 55m
2026-07-08 UKP154 - Jul 8, 17:00 UTCJul 8, 21:25 UTC4h 25m
2026-07-08 UKP154 - Jul 8, 15:45 UTCJul 8, 16:35 UTC50m
2026-07-06 UKP154 EMA → EMA Jul 6, 15:25 UTCJul 6, 16:30 UTC1h 5m
2026-07-05 UKP154 EMA → EMA Jul 5, 15:40 UTCJul 5, 17:55 UTC2h 15m
2026-07-04 UKP154 EMA → EMA Jul 4, 19:35 UTCJul 4, 21:35 UTC2h 0m
2026-07-04 UKP154 EMA → EMA Jul 4, 11:35 UTCJul 4, 16:15 UTC4h 40m
2026-07-02 UKP154 EMA → EMA Jul 2, 18:15 UTCJul 2, 21:00 UTC2h 45m
2026-06-30 UKP154 EMA → EMA Jun 30, 22:10 UTCJun 30, 23:30 UTC1h 20m
2026-06-29 UKP154 EMA → EMA Jun 29, 20:35 UTCJun 29, 21:14 UTC40m
2026-06-29 UKP154 EMA → EMA Jun 29, 18:30 UTCJun 29, 19:44 UTC1h 15m
2026-06-29 UKP154 EMA → EMA Jun 29, 15:04 UTCJun 29, 16:00 UTC55m
2026-06-28 UKP154 EMA → EMA Jun 28, 18:40 UTCJun 28, 19:34 UTC55m
2026-06-28 UKP154 EMA → EMA Jun 28, 11:50 UTCJun 28, 15:55 UTC4h 5m
2026-06-25 UKP154 EMA → EMA Jun 25, 19:29 UTCJun 25, 21:10 UTC1h 40m
2026-06-23 UKP154 EMA → EMA Jun 23, 21:05 UTCJun 23, 22:55 UTC1h 50m
2026-06-22 UKP154 - Jun 22, 19:29 UTCJun 22, 19:40 UTC10m
2026-06-22 UKP154 EMA → EMA Jun 22, 17:50 UTCJun 22, 18:49 UTC1h 0m
2026-06-22 UKP154 EMA → EMA Jun 22, 15:14 UTCJun 22, 16:29 UTC1h 15m
2026-06-21 UKP154 EMA → EMA Jun 21, 20:24 UTCJun 21, 22:34 UTC2h 10m
2026-06-21 UKP154 - Jun 21, 14:10 UTCJun 21, 16:59 UTC2h 50m
2026-06-20 UKP154 EMA → EMA Jun 20, 22:05 UTCJun 20, 22:54 UTC50m
2026-06-20 UKP154 EMA → EMA Jun 20, 18:19 UTCJun 20, 18:49 UTC30m
2026-06-20 UKP154 EMA → EMA Jun 20, 15:44 UTCJun 20, 16:34 UTC50m
2026-06-19 UKP154 EMA → EMA Jun 19, 15:59 UTCJun 19, 19:34 UTC3h 35m
2026-06-18 UKP154 EMA → EMA Jun 18, 20:50 UTCJun 18, 22:00 UTC1h 10m
2026-06-18 UKP154 EMA → EMA Jun 18, 13:45 UTCJun 18, 15:35 UTC1h 50m
2026-06-17 UKP154 EMA → EMA Jun 17, 18:15 UTCJun 17, 19:35 UTC1h 20m
2026-06-17 UKP154 EMA → EMA Jun 17, 13:55 UTCJun 17, 15:55 UTC2h 0m
2026-06-16 UKP154 EMA → EMA Jun 16, 13:50 UTCJun 16, 17:24 UTC3h 35m
2026-06-15 UKP154 - Jun 15, 21:35 UTCJun 15, 23:19 UTC1h 45m
2026-06-15 UKP154 - Jun 15, 18:25 UTCJun 15, 20:50 UTC2h 25m
2026-06-15 UKP154 EMA → EMA Jun 15, 14:05 UTCJun 15, 17:04 UTC3h 0m
2026-06-14 UKP154 EMA → EMA Jun 14, 19:20 UTCJun 14, 22:05 UTC2h 45m
2026-06-14 UKP154 EMA → EMA Jun 14, 15:45 UTCJun 14, 17:10 UTC1h 25m
2026-06-13 UKP154 EMA → EMA Jun 13, 15:40 UTCJun 13, 20:55 UTC5h 15m
2026-06-13 UKP154 EMA → EMA Jun 13, 11:15 UTCJun 13, 14:00 UTC2h 45m
2026-04-22 UKP154 OXF → EMA Apr 22, 19:25 UTCApr 22, 20:50 UTC1h 25m
2026-04-22 UKP154 EMA → OXF Apr 22, 15:15 UTCApr 22, 18:15 UTC3h 0m

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

Mode-S 4078A4 frequently asked

What is Mode-S code 4078A4?
4078A4 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-POLW.
Where is Mode-S 4078A4 registered?
Mode-S code 4078A4 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 4078A4 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4078A4, octal 20074244, decimal 4,225,188.
What flights does 4078A4 operate?
Mode-S 4078A4 has broadcast 1 distinct callsign, including UKP154.