Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2B17A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27287 · operated by UNITED AIRLINES INC

Hex
A2B17A
Octal
50530572
Decimal
10,662,266
Country
US
Tail
N27287
Type
B38M
Broadcasting now · callsign UAL739 · 37,000 ft
Flights observed
456
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

A2B17A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B17A 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
UAL1769 United Airlines 7 2026-05-16
UAL643 - 6 2026-07-06
UAL359 United Airlines 5 2026-05-10
UAL2482 - 5 2026-06-18
UAL1880 United Airlines 5 2026-07-19
UAL1551 United Airlines 5 2026-07-24
UAL841 United Airlines 4 2026-04-16
UAL716 United Airlines 4 2026-05-26
UAL649 United Airlines 4 2026-05-19
UAL518 United Airlines 4 2026-06-09
UAL474 United Airlines 4 2026-05-10
UAL291 United Airlines 4 2026-06-06
UAL275 United Airlines 4 2026-04-29
UAL267 United Airlines 4 2026-05-12
UAL2621 - 4 2026-07-04
UAL222 United Airlines 4 2026-07-20
UAL1911 United Airlines 4 2026-04-29
UAL1099 United Airlines 4 2026-05-04
UAL1096 United Airlines 4 2026-05-04
UAL1002 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2745 HNL → SFO Jul 26, 19:45 UTCJul 26, 22:05 UTC2h 20m
2026-07-26 UAL2637 DEN → CHS Jul 26, 16:20 UTCJul 26, 18:25 UTC2h 5m
2026-07-26 UAL361 DEN → BOS Jul 26, 10:50 UTCJul 26, 12:30 UTC1h 40m
2026-07-26 UAL1942 MSY → SFO Jul 26, 01:40 UTCJul 26, 03:20 UTC1h 40m
2026-07-25 UAL1918 LIR → DEN Jul 25, 12:00 UTCJul 25, 23:15 UTC11h 15m
2026-07-24 UAL1560 SJO → EWR Jul 24, 19:18 UTCJul 24, 23:48 UTC4h 30m
2026-07-24 UAL1560 SJO → EWR Jul 24, 19:15 UTCJul 25, 00:00 UTC4h 45m
2026-07-24 UAL1080 EWR → SJO Jul 24, 12:55 UTCJul 24, 17:45 UTC4h 50m
2026-07-24 UAL258 GUA → EWR Jul 24, 05:10 UTCJul 24, 09:20 UTC4h 10m
2026-07-24 UAL1551 EWR → GUA Jul 24, 02:45 UTCJul 24, 02:55 UTC10m
2026-07-23 UAL1551 EWR → GUA Jul 23, 22:55 UTCJul 24, 02:15 UTC3h 20m
2026-07-23 UAL2677 CLE → DEN Jul 23, 17:00 UTCJul 23, 21:10 UTC4h 10m
2026-07-23 UAL2646 DEN → SJC Jul 23, 10:45 UTCJul 23, 15:25 UTC4h 40m
2026-07-22 UAL583 LGA → IAH Jul 22, 22:30 UTCJul 23, 00:40 UTC2h 10m
2026-07-22 UAL583 LGA → IAH Jul 22, 22:30 UTCJul 23, 00:33 UTC2h 3m
2026-07-22 UAL2215 FLL → EWR Jul 22, 18:35 UTCJul 22, 20:50 UTC2h 15m
2026-07-22 UAL523 EWR → EWR Jul 22, 00:30 UTCJul 22, 15:35 UTC15h 5m
2026-07-21 UAL1064 - Jul 21, 13:45 UTCJul 21, 18:10 UTC4h 25m
2026-07-20 UAL1065 EWR → MEX Jul 20, 19:40 UTCJul 21, 00:05 UTC4h 24m
2026-07-20 UAL221 SFO → MCO Jul 20, 10:10 UTCJul 20, 16:30 UTC6h 20m
2026-07-20 UAL221 SFO → MCO Jul 20, 10:06 UTCJul 20, 17:21 UTC7h 15m
2026-07-20 UAL222 IAD → SFO Jul 20, 02:40 UTCJul 20, 04:05 UTC1h 25m
2026-07-20 UAL222 IAD → SFO Jul 20, 02:08 UTCJul 20, 08:47 UTC6h 39m
2026-07-20 UAL222 IAD → SFO Jul 20, 02:08 UTCJul 20, 08:35 UTC6h 27m
2026-07-19 UAL1880 SXM → EWR Jul 19, 18:15 UTCJul 19, 21:50 UTC3h 35m
2026-07-19 UAL1880 SXM → EWR Jul 19, 17:53 UTCJul 19, 21:46 UTC3h 53m
2026-07-19 UAL346 - Jul 19, 12:30 UTCJul 19, 15:50 UTC3h 20m
2026-07-19 UAL498 PDX → IAD Jul 19, 06:40 UTCJul 19, 10:55 UTC4h 15m
2026-07-19 UAL2413 EWR → DFW Jul 19, 04:10 UTCJul 19, 05:20 UTC1h 10m
2026-07-19 UAL2413 EWR → DFW Jul 19, 04:14 UTCJul 19, 05:17 UTC1h 3m
2026-07-18 UAL477 BOS → SFO Jul 18, 22:35 UTCJul 19, 02:45 UTC4h 10m
2026-07-18 UAL840 - Jul 18, 14:55 UTCJul 18, 20:50 UTC5h 55m
2026-07-18 UAL2389 - Jul 18, 10:35 UTCJul 18, 12:30 UTC1h 55m
2026-07-18 UAL2783 - Jul 18, 00:15 UTCJul 18, 03:20 UTC3h 6m
2026-07-17 UAL2208 - Jul 17, 17:40 UTCJul 17, 22:15 UTC4h 35m
2026-07-17 UAL2208 STT → IAH Jul 17, 17:33 UTCJul 17, 22:04 UTC4h 31m
2026-07-17 UAL1443 - Jul 17, 12:35 UTCJul 17, 15:49 UTC3h 15m
2026-07-17 UAL2766 ORD → IAD Jul 17, 03:25 UTCJul 17, 04:39 UTC1h 15m
2026-07-16 UAL1352 - Jul 16, 21:40 UTCJul 17, 01:39 UTC4h 0m
2026-07-16 UAL1352 SNA → ORD Jul 16, 21:23 UTCJul 17, 01:12 UTC3h 49m
2026-07-16 UAL1320 - Jul 16, 17:40 UTCJul 16, 19:30 UTC1h 50m
2026-07-16 UAL690 - Jul 16, 13:10 UTCJul 16, 14:29 UTC1h 20m
2026-07-16 UAL690 CLE → DEN Jul 16, 13:09 UTCJul 16, 15:39 UTC2h 30m
2026-07-16 UAL2641 - Jul 16, 06:00 UTCJul 16, 10:04 UTC4h 5m
2026-07-16 UAL418 - Jul 16, 03:15 UTCJul 16, 03:55 UTC40m
2026-07-15 UAL417 - Jul 15, 21:15 UTCJul 15, 21:25 UTC10m
2026-07-15 UAL417 - Jul 15, 16:15 UTCJul 15, 16:45 UTC30m
2026-07-14 UAL627 - Jul 14, 18:35 UTCJul 15, 05:55 UTC11h 19m
2026-07-14 UAL776 - Jul 14, 11:25 UTCJul 14, 15:25 UTC4h 0m
2026-07-14 UAL776 CLE → LAX Jul 14, 11:28 UTCJul 14, 15:20 UTC3h 52m

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 N27287 page for operator, model, and routing details .

Mode-S A2B17A frequently asked

What is Mode-S code A2B17A?
A2B17A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27287.
Where is Mode-S A2B17A registered?
Mode-S code A2B17A 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 A2B17A broadcasting right now?
Yes. Mode-S A2B17A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B17A, octal 50530572, decimal 10,662,266.
What flights does A2B17A operate?
Mode-S A2B17A has broadcast 20 distinct callsigns, including UAL1769, UAL643, UAL359, UAL2482, UAL1880.