Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2B10D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27253 · BOEING 737 MAX 8 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A2B10D
Octal
50530415
Decimal
10,662,157
Country
US
Tail
N27253
Type
B38M
Broadcasting now · callsign UAL2312 · 37,000 ft
Flights observed
441
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

A2B10D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B10D 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 20 distinct

Callsign Airline Flights Last seen
UAL1903 United Airlines 6 2026-06-03
UAL394 United Airlines 5 2026-07-26
UAL2432 United Airlines 5 2026-06-25
UAL2199 United Airlines 5 2026-05-12
UAL1685 United Airlines 5 2026-06-11
UAL1079 United Airlines 5 2026-06-16
UAL518 - 4 2026-07-12
UAL504 United Airlines 4 2026-07-20
UAL268 United Airlines 4 2026-06-01
UAL2614 United Airlines 4 2026-07-24
UAL2353 United Airlines 4 2026-05-04
UAL1751 United Airlines 4 2026-06-02
UAL1589 United Airlines 4 2026-06-04
UAL1153 United Airlines 4 2026-07-26
UAL2681 - 3 2026-06-28
UAL2664 - 3 2026-07-19
UAL258 - 3 2026-06-20
UAL2384 United Airlines 3 2026-07-20
UAL2349 United Airlines 3 2026-07-18
UAL209 United Airlines 3 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1153 MYR → EWR Jul 26, 20:20 UTCJul 26, 21:15 UTC55m
2026-07-26 UAL394 OGG → SFO Jul 26, 13:50 UTCJul 26, 18:40 UTC4h 50m
2026-07-26 UAL1959 ANC → DEN Jul 26, 00:22 UTCJul 26, 05:04 UTC4h 42m
2026-07-26 UAL1959 ANC → DEN Jul 26, 00:15 UTCJul 26, 05:05 UTC4h 50m
2026-07-25 UAL280 DEN → ANC Jul 25, 17:50 UTCJul 25, 22:45 UTC4h 55m
2026-07-25 UAL513 DEN → PHL Jul 25, 14:05 UTCJul 25, 15:55 UTC1h 50m
2026-07-25 UAL725T IAH → SFO Jul 25, 03:10 UTCJul 25, 05:05 UTC1h 55m
2026-07-25 UAL725T IAH → SFO Jul 25, 03:03 UTCJul 25, 05:00 UTC1h 57m
2026-07-24 UAL1153 MYR → EWR Jul 24, 20:20 UTCJul 25, 01:05 UTC4h 45m
2026-07-24 UAL394 OGG → SFO Jul 24, 13:55 UTCJul 24, 19:00 UTC5h 5m
2026-07-24 UAL2614 LAX → EWR Jul 24, 07:27 UTCJul 24, 11:44 UTC4h 17m
2026-07-24 UAL2614 LAX → EWR Jul 24, 07:15 UTCJul 24, 11:40 UTC4h 25m
2026-07-23 UAL2073 DEN → SFO Jul 23, 22:25 UTCJul 24, 05:45 UTC7h 20m
2026-07-23 UAL2463 ORD → MCO Jul 23, 15:35 UTCJul 23, 19:50 UTC4h 15m
2026-07-23 UAL1796 EWR → ORD Jul 23, 01:50 UTCJul 23, 07:10 UTC5h 20m
2026-07-22 UAL3024 DEN → SFO Jul 22, 19:50 UTCJul 22, 23:38 UTC3h 48m
2026-07-22 UAL3024 DEN → SFO Jul 22, 19:50 UTCJul 22, 23:43 UTC3h 53m
2026-07-21 UAL1699 - Jul 21, 16:15 UTCJul 21, 20:50 UTC4h 35m
2026-07-21 UAL1607 IND → DEN Jul 21, 12:15 UTCJul 21, 14:40 UTC2h 25m
2026-07-21 UAL2477 EWR → SMF Jul 21, 06:35 UTCJul 21, 09:15 UTC2h 40m
2026-07-21 UAL2477 EWR → SMF Jul 21, 06:34 UTCJul 21, 10:27 UTC3h 53m
2026-07-21 UAL2799 ORD → SFO Jul 21, 01:05 UTCJul 21, 05:05 UTC4h 0m
2026-07-20 UAL1902 - Jul 20, 19:05 UTCJul 20, 22:55 UTC3h 50m
2026-07-20 UAL1596 PDX → SFO Jul 20, 16:15 UTCJul 20, 17:40 UTC1h 25m
2026-07-20 UAL2384 ORD → SFO Jul 20, 06:55 UTCJul 20, 08:00 UTC1h 5m
2026-07-20 UAL2384 ORD → SFO Jul 20, 06:43 UTCJul 20, 07:59 UTC1h 16m
2026-07-20 UAL504 DEN → LGA Jul 20, 00:30 UTCJul 20, 05:30 UTC5h 0m
2026-07-20 UAL504 DEN → LGA Jul 20, 00:27 UTCJul 20, 05:25 UTC4h 58m
2026-07-19 UAL2664 - Jul 19, 18:10 UTCJul 19, 22:50 UTC4h 40m
2026-07-19 UAL2664 SFO → BWI Jul 19, 17:54 UTCJul 19, 22:45 UTC4h 51m
2026-07-19 UAL1125 - Jul 19, 15:10 UTCJul 19, 16:00 UTC50m
2026-07-19 UAL1124 SFO → OGG Jul 19, 05:04 UTCJul 19, 09:39 UTC4h 35m
2026-07-19 UAL1124 - Jul 19, 05:00 UTCJul 19, 05:50 UTC50m
2026-07-19 UAL2841 LAS → SFO Jul 19, 01:55 UTCJul 19, 02:55 UTC1h 0m
2026-07-18 UAL2855 - Jul 18, 22:55 UTCJul 19, 00:05 UTC1h 10m
2026-07-18 UAL2349 LIR → SFO Jul 18, 15:35 UTCJul 18, 20:50 UTC5h 15m
2026-07-17 UAL2349 LIR → SFO Jul 17, 23:20 UTCJul 18, 20:50 UTC21h 31m
2026-07-17 UAL2349 LIR → SFO Jul 17, 21:20 UTCJul 18, 20:50 UTC23h 31m
2026-07-17 UAL2139 - Jul 17, 19:20 UTCJul 18, 19:15 UTC23h 56m
2026-07-17 UAL2139 - Jul 17, 18:19 UTCJul 18, 17:15 UTC22h 56m
2026-07-17 UAL611 CHS → EWR Jul 17, 10:44 UTCJul 17, 15:44 UTC5h 0m
2026-07-16 UAL2375 - Jul 16, 20:15 UTCJul 16, 23:20 UTC3h 5m
2026-07-16 UAL2285 SMF → DEN Jul 16, 15:55 UTCJul 16, 17:49 UTC1h 55m
2026-07-16 UAL1302 - Jul 16, 06:30 UTCJul 16, 06:50 UTC20m
2026-07-15 UAL368 - Jul 15, 22:40 UTCJul 16, 03:40 UTC5h 0m
2026-07-15 UAL1678 SFO → DCA Jul 15, 15:30 UTCJul 15, 20:20 UTC4h 50m
2026-07-15 UAL1750 OGG → SFO Jul 15, 08:06 UTCJul 15, 12:18 UTC4h 12m
2026-07-15 UAL1750 OGG → SFO Jul 15, 08:06 UTCJul 15, 12:19 UTC4h 13m
2026-07-15 UAL1749 SFO → OGG Jul 15, 00:56 UTCJul 15, 05:46 UTC4h 50m
2026-07-15 UAL1749 - Jul 15, 00:55 UTCJul 15, 01:15 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 N27253 page for operator, model, and routing details .

Mode-S A2B10D frequently asked

What is Mode-S code A2B10D?
A2B10D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27253.
Where is Mode-S A2B10D registered?
Mode-S code A2B10D 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 A2B10D broadcasting right now?
Yes. Mode-S A2B10D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B10D, octal 50530415, decimal 10,662,157.
What flights does A2B10D operate?
Mode-S A2B10D has broadcast 20 distinct callsigns, including UAL1903, UAL394, UAL2432, UAL2199, UAL1685.