Apparatus

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sensors Mode-S transponder

4841A9

ICAO 24-bit transponder address · allocated to Netherlands

Currently assigned to PH-HZW · BOEING 737-800

Hex
4841A9
Octal
22040651
Decimal
4,735,401
Country
NL
Tail
PH-HZW
Type
B738
No current signal · last broadcast 1d ago
Flights observed
27
Distinct callsigns
14
Country
NL
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4841A9.

Country allocation

The ICAO 24-bit address 4841A9 falls within the block assigned to Netherlands (NL) by ICAO Annex 10, Volume III. Every aircraft registered in Netherlands 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 14 distinct

Callsign Airline Flights Last seen
TRA5749 Transavia Holland 3 2026-04-15
TRA8B Transavia Holland 2 2026-04-14
TRA89E - 2 2026-04-16
TRA79X Transavia Holland 2 2026-04-14
TRA79H Transavia Holland 2 2026-04-16
TRA72W Transavia Holland 2 2026-04-16
TRA70M - 2 2026-04-15
TRA6709 Transavia Holland 2 2026-04-15
TRA48A - 2 2026-04-15
TRA36J Transavia Holland 2 2026-04-17
TRA1E Transavia Holland 2 2026-04-16
TRA19M Transavia Holland 2 2026-04-17
TRA5964 - 1 2026-04-12
TRA5963 - 1 2026-04-12

Recent flights last 27

DateFlightRouteTakeoffLandingDuration
2026-04-17 TRA19M BRU → TFS Apr 17, 13:20 UTCApr 17, 14:40 UTC1h 20m
2026-04-17 TRA19M BRU → TFS Apr 17, 12:15 UTCApr 17, 13:15 UTC1h 0m
2026-04-17 TRA36J AMS → AGP Apr 17, 09:20 UTCApr 17, 10:35 UTC1h 15m
2026-04-17 TRA36J AMS → AGP Apr 17, 08:10 UTCApr 17, 09:15 UTC1h 5m
2026-04-16 TRA89E - Apr 16, 19:15 UTCApr 16, 21:05 UTC1h 50m
2026-04-16 TRA89E - Apr 16, 18:15 UTCApr 16, 19:10 UTC55m
2026-04-16 TRA1E EIN → ALC Apr 16, 15:15 UTCApr 16, 17:05 UTC1h 50m
2026-04-16 TRA1E EIN → ALC Apr 16, 14:40 UTCApr 16, 15:10 UTC30m
2026-04-16 TRA72W AMS → SVQ Apr 16, 09:10 UTCApr 16, 09:19 UTC10m
2026-04-16 TRA72W AMS → SVQ Apr 16, 07:09 UTCApr 16, 09:05 UTC1h 55m
2026-04-16 TRA79H AMS → IBZ Apr 16, 05:09 UTCApr 16, 05:49 UTC40m
2026-04-16 TRA79H AMS → IBZ Apr 16, 03:45 UTCApr 16, 05:05 UTC1h 20m
2026-04-15 TRA70M - Apr 15, 21:05 UTCApr 15, 23:00 UTC1h 55m
2026-04-15 TRA70M - Apr 15, 20:10 UTCApr 15, 21:00 UTC50m
2026-04-15 TRA5749 AMS → CMN Apr 15, 17:05 UTCApr 15, 17:50 UTC45m
2026-04-15 TRA5749 AMS → CMN Apr 15, 15:05 UTCApr 15, 17:00 UTC1h 55m
2026-04-15 TRA5749 AMS → CMN Apr 15, 14:50 UTCApr 15, 14:55 UTC5m
2026-04-15 TRA48A - Apr 15, 11:00 UTCApr 15, 12:35 UTC1h 35m
2026-04-15 TRA48A - Apr 15, 09:35 UTCApr 15, 10:55 UTC1h 20m
2026-04-15 TRA6709 EIN → ATH Apr 15, 07:01 UTCApr 15, 08:35 UTC1h 35m
2026-04-15 TRA6709 EIN → ATH Apr 15, 05:50 UTCApr 15, 06:55 UTC1h 5m
2026-04-14 TRA8B RTM → LIS Apr 14, 18:55 UTCApr 14, 19:45 UTC50m
2026-04-14 TRA8B RTM → LIS Apr 14, 17:05 UTCApr 14, 18:45 UTC1h 40m
2026-04-14 TRA79X ALC → BRU Apr 14, 14:50 UTCApr 14, 15:55 UTC1h 5m
2026-04-14 TRA79X ALC → BRU Apr 14, 13:40 UTCApr 14, 14:45 UTC1h 5m
2026-04-12 TRA5964 - Apr 12, 19:20 UTCApr 12, 20:15 UTC55m
2026-04-12 TRA5963 - Apr 12, 17:20 UTCApr 12, 18:20 UTC1h 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 PH-HZW page for operator, model, and routing details .

Mode-S 4841A9 frequently asked

What is Mode-S code 4841A9?
4841A9 is an ICAO 24-bit transponder address. Allocated to Netherlands. Assigned to PH-HZW.
Where is Mode-S 4841A9 registered?
Mode-S code 4841A9 is allocated to Netherlands (NL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4841A9 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4841A9, octal 22040651, decimal 4,735,401.
What flights does 4841A9 operate?
Mode-S 4841A9 has broadcast 14 distinct callsigns, including TRA5749, TRA8B, TRA89E, TRA79X, TRA79H.