sensors Mode-S transponder

A1421B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N180QS · BOMBARDIER BD-700 Global 7000/7500 · operated by BANK OF AMERICA NA, D&S BEST WAY HOLDINGS LLC, IRON MOUNTAIN INC, IT PERSONAL SERVICES LLC, NATIONAL GYPSUM SERVICES CO, RTG FURNITURE CORP OF GEORGIA

Hex
A1421B
Octal
50241033
Decimal
10,568,219
Country
US
Tail
N180QS
Type
GL7T
No current signal · last broadcast 5h ago
Flights observed
59
Distinct callsigns
2
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A1421B.

Country allocation

The ICAO 24-bit address A1421B 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 2 distinct

Callsign Airline Flights Last seen
EJA180 NetJets 31 2026-05-29
N180QS - 28 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 EJA180 SJC → LAX May 29, 23:30 UTCMay 30, 00:10 UTC40m
2026-05-29 EJA180 SJC → LAX May 29, 18:55 UTCMay 29, 21:35 UTC2h 40m
2026-05-29 EJA180 SJC → LAX May 29, 16:45 UTCMay 29, 17:45 UTC1h 0m
2026-05-28 N180QS PRG → IAD May 28, 11:05 UTCMay 28, 19:05 UTC8h 0m
2026-05-27 N180QS IAD → PRG May 27, 01:29 UTCMay 27, 08:55 UTC7h 26m
2026-05-25 EJA180 SJC → LAX May 25, 20:59 UTCMay 25, 21:30 UTC30m
2026-05-24 N180QS - May 24, 08:25 UTCMay 24, 18:40 UTC10h 15m
2026-05-24 N180QS - May 24, 06:00 UTCMay 24, 06:30 UTC30m
2026-05-22 N180QS - May 22, 10:25 UTCMay 22, 12:50 UTC2h 25m
2026-05-22 N180QS - May 22, 02:30 UTCMay 22, 09:00 UTC6h 30m
2026-05-22 EJA180 SJC → LAX May 22, 00:55 UTCMay 22, 01:30 UTC35m
2026-05-20 EJA180 SJC → LAX May 20, 21:25 UTCMay 20, 22:50 UTC1h 25m
2026-05-20 EJA180 SJC → LAX May 20, 15:40 UTCMay 20, 19:50 UTC4h 10m
2026-05-18 N180QS - May 18, 22:40 UTCMay 18, 23:25 UTC45m
2026-05-18 N180QS - May 18, 19:10 UTCMay 18, 19:20 UTC10m
2026-05-17 N180QS HNL → KOA May 17, 23:40 UTCMay 18, 00:05 UTC25m
2026-05-15 N180QS - May 15, 17:00 UTCMay 16, 01:35 UTC8h 35m
2026-05-13 N180QS - May 13, 21:25 UTCMay 14, 05:55 UTC8h 30m
2026-05-11 N180QS - May 11, 18:25 UTCMay 11, 19:05 UTC40m
2026-05-10 EJA180 SJC → LAX May 10, 17:20 UTCMay 10, 20:25 UTC3h 5m
2026-05-09 N180QS MAD → AUS May 9, 14:35 UTCMay 10, 00:20 UTC9h 45m
2026-05-07 N180QS - May 7, 23:34 UTCMay 8, 06:04 UTC6h 30m
2026-05-06 EJA180 SJC → LAX May 6, 21:05 UTCMay 6, 22:05 UTC1h 0m
2026-05-06 EJA180 SJC → LAX May 6, 17:30 UTCMay 6, 17:50 UTC19m
2026-05-06 EJA180 SJC → LAX May 6, 14:15 UTCMay 6, 16:35 UTC2h 20m
2026-05-05 EJA180 SJC → LAX May 5, 22:25 UTCMay 5, 22:40 UTC15m
2026-05-04 EJA180 SJC → LAX May 4, 20:10 UTCMay 4, 20:45 UTC35m
2026-05-04 EJA180 SJC → LAX May 4, 18:30 UTCMay 4, 19:05 UTC36m
2026-05-04 EJA180 SJC → LAX May 4, 13:25 UTCMay 4, 15:45 UTC2h 20m
2026-04-27 EJA180 SJC → LAX Apr 27, 22:50 UTCApr 28, 01:45 UTC2h 55m
2026-04-27 EJA180 SJC → LAX Apr 27, 16:45 UTCApr 27, 21:25 UTC4h 40m
2026-04-25 EJA180 SJC → LAX Apr 25, 19:00 UTCApr 25, 19:45 UTC45m
2026-04-25 EJA180 SJC → LAX Apr 25, 02:55 UTCApr 25, 03:35 UTC40m
2026-04-24 EJA180 SJC → LAX Apr 24, 22:10 UTCApr 25, 00:10 UTC2h 0m
2026-04-24 N180QS - Apr 24, 02:35 UTCApr 24, 07:30 UTC4h 55m
2026-04-23 N180QS - Apr 23, 23:50 UTCApr 24, 00:05 UTC15m
2026-04-23 N180QS - Apr 23, 19:05 UTCApr 23, 19:45 UTC40m
2026-04-23 EJA180 SJC → LAX Apr 23, 16:40 UTCApr 23, 17:05 UTC25m
2026-04-22 EJA180 SJC → LAX Apr 22, 16:40 UTCApr 22, 20:10 UTC3h 30m
2026-04-21 EJA180 SJC → LAX Apr 21, 16:20 UTCApr 21, 18:35 UTC2h 15m
2026-04-20 EJA180 SJC → LAX Apr 20, 16:25 UTCApr 20, 19:35 UTC3h 10m
2026-04-20 EJA180 SJC → LAX Apr 20, 14:30 UTCApr 20, 14:45 UTC15m
2026-04-19 EJA180 SJC → LAX Apr 19, 18:10 UTCApr 19, 19:05 UTC55m
2026-04-19 EJA180 SJC → LAX Apr 19, 15:35 UTCApr 19, 15:50 UTC15m
2026-04-18 EJA180 SJC → LAX Apr 18, 15:45 UTCApr 18, 20:55 UTC5h 10m
2026-04-16 N180QS - Apr 16, 19:30 UTCApr 16, 20:55 UTC1h 25m
2026-04-16 N180QS - Apr 16, 15:15 UTCApr 16, 15:50 UTC35m
2026-04-16 N180QS - Apr 16, 13:25 UTCApr 16, 15:10 UTC1h 45m
2026-04-16 N180QS - Apr 16, 11:09 UTCApr 16, 11:44 UTC35m
2026-04-16 N180QS - Apr 16, 10:45 UTCApr 16, 11:04 UTC20m

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 N180QS page for operator, model, and routing details .

Mode-S A1421B frequently asked

What is Mode-S code A1421B?
A1421B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N180QS.
Where is Mode-S A1421B registered?
Mode-S code A1421B 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 A1421B broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1421B, octal 50241033, decimal 10,568,219.
What flights does A1421B operate?
Mode-S A1421B has broadcast 2 distinct callsigns, including EJA180, N180QS.