Apparatus

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sensors Mode-S transponder

A1B4BB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N209PD · GIPPSAERO GA-8 Airvan · operated by MODESTO POLICE DEPARTMENT

Hex
A1B4BB
Octal
50332273
Decimal
10,597,563
Country
US
Tail
N209PD
Type
GA8
No current signal · last broadcast 6h ago
Flights observed
118
Distinct callsigns
1
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A1B4BB.

Country allocation

The ICAO 24-bit address A1B4BB falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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
N209PD - 118 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N209PD MOD → MOD Jul 14, 03:45 UTCJul 14, 04:50 UTC1h 5m
2026-07-13 N209PD - Jul 13, 23:45 UTCJul 14, 02:55 UTC3h 10m
2026-07-12 N209PD MOD → MOD Jul 12, 04:45 UTCJul 12, 08:50 UTC4h 5m
2026-07-12 N209PD - Jul 12, 00:30 UTCJul 12, 03:05 UTC2h 35m
2026-07-11 N209PD MOD → MOD Jul 11, 05:15 UTCJul 11, 08:45 UTC3h 30m
2026-07-11 N209PD - Jul 11, 00:55 UTCJul 11, 03:45 UTC2h 50m
2026-07-06 N209PD - Jul 6, 05:10 UTCJul 6, 07:15 UTC2h 5m
2026-07-06 N209PD - Jul 6, 03:45 UTCJul 6, 03:55 UTC10m
2026-07-06 N209PD - Jul 6, 00:40 UTCJul 6, 02:50 UTC2h 10m
2026-07-04 N209PD - Jul 4, 16:20 UTCJul 4, 17:05 UTC45m
2026-07-04 N209PD - Jul 4, 08:45 UTCJul 4, 09:15 UTC30m
2026-07-04 N209PD - Jul 4, 07:45 UTCJul 4, 08:10 UTC25m
2026-07-04 N209PD - Jul 4, 04:15 UTCJul 4, 07:15 UTC3h 0m
2026-07-04 N209PD - Jul 4, 00:20 UTCJul 4, 03:05 UTC2h 45m
2026-07-03 N209PD - Jul 3, 04:05 UTCJul 3, 08:30 UTC4h 25m
2026-07-03 N209PD - Jul 3, 00:55 UTCJul 3, 02:50 UTC1h 55m
2026-07-02 N209PD - Jul 2, 06:45 UTCJul 2, 08:25 UTC1h 40m
2026-07-02 N209PD MOD → MOD Jul 2, 00:35 UTCJul 2, 05:40 UTC5h 5m
2026-07-01 N209PD - Jul 1, 03:00 UTCJul 1, 06:25 UTC3h 25m
2026-07-01 N209PD MOD → MOD Jul 1, 00:35 UTCJul 1, 02:30 UTC1h 55m
2026-06-30 N209PD MOD → MOD Jun 30, 21:00 UTCJun 30, 23:10 UTC2h 10m
2026-06-30 N209PD MOD → MOD Jun 30, 03:40 UTCJun 30, 08:25 UTC4h 45m
2026-06-30 N209PD - Jun 30, 00:20 UTCJun 30, 02:10 UTC1h 50m
2026-06-29 N209PD - Jun 29, 07:40 UTCJun 29, 08:29 UTC50m
2026-06-29 N209PD - Jun 29, 03:44 UTCJun 29, 07:34 UTC3h 50m
2026-06-29 N209PD - Jun 29, 00:24 UTCJun 29, 02:39 UTC2h 15m
2026-06-28 N209PD - Jun 28, 06:34 UTCJun 28, 08:29 UTC1h 55m
2026-06-28 N209PD - Jun 28, 03:50 UTCJun 28, 05:55 UTC2h 5m
2026-06-28 N209PD - Jun 28, 00:25 UTCJun 28, 02:29 UTC2h 5m
2026-06-27 N209PD - Jun 27, 03:49 UTCJun 27, 09:04 UTC5h 15m
2026-06-27 N209PD - Jun 27, 01:54 UTCJun 27, 02:35 UTC40m
2026-06-27 N209PD - Jun 27, 00:25 UTCJun 27, 00:34 UTC10m
2026-06-26 N209PD - Jun 26, 04:45 UTCJun 26, 09:00 UTC4h 15m
2026-06-26 N209PD - Jun 26, 00:59 UTCJun 26, 02:54 UTC1h 55m
2026-06-25 N209PD - Jun 25, 05:15 UTCJun 25, 07:59 UTC2h 45m
2026-06-24 N209PD - Jun 24, 23:40 UTCJun 25, 03:34 UTC3h 55m
2026-06-21 N209PD - Jun 21, 07:14 UTCJun 21, 09:04 UTC1h 50m
2026-06-21 N209PD - Jun 21, 05:04 UTCJun 21, 06:40 UTC1h 35m
2026-06-21 N209PD - Jun 21, 00:19 UTCJun 21, 03:44 UTC3h 25m
2026-06-20 N209PD - Jun 20, 04:59 UTCJun 20, 08:19 UTC3h 20m
2026-06-20 N209PD - Jun 20, 00:39 UTCJun 20, 02:49 UTC2h 10m
2026-06-19 N209PD - Jun 19, 04:25 UTCJun 19, 08:59 UTC4h 35m
2026-06-19 N209PD - Jun 19, 00:59 UTCJun 19, 03:09 UTC2h 10m
2026-06-18 N209PD - Jun 18, 04:15 UTCJun 18, 07:15 UTC3h 0m
2026-06-18 N209PD - Jun 18, 00:10 UTCJun 18, 03:05 UTC2h 55m
2026-06-17 N209PD - Jun 17, 23:10 UTCJun 17, 23:20 UTC10m
2026-06-14 N209PD - Jun 14, 05:15 UTCJun 14, 08:50 UTC3h 35m
2026-06-14 N209PD - Jun 14, 00:25 UTCJun 14, 03:35 UTC3h 10m
2026-06-13 N209PD - Jun 13, 04:45 UTCJun 13, 08:45 UTC4h 0m
2026-06-12 N209PD - Jun 12, 22:35 UTCJun 13, 03:10 UTC4h 35m

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 N209PD page for operator, model, and routing details .

Mode-S A1B4BB frequently asked

What is Mode-S code A1B4BB?
A1B4BB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N209PD.
Where is Mode-S A1B4BB registered?
Mode-S code A1B4BB is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A1B4BB broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B4BB, octal 50332273, decimal 10,597,563.
What flights does A1B4BB operate?
Mode-S A1B4BB has broadcast 1 distinct callsign, including N209PD.