Apparatus

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sensors Mode-S transponder

A9249C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N68891 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A9249C
Octal
52222234
Decimal
11,084,956
Country
US
Tail
N68891
Type
B739
Broadcasting now · callsign UAL1611 · 1,800 ft
Flights observed
439
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

A9249C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9249C 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
UAL1900 - 7 2026-07-04
UAL1891 United Airlines 5 2026-05-19
UAL1850 United Airlines 5 2026-05-29
UAL427 United Airlines 4 2026-04-14
UAL2255 United Airlines 4 2026-05-18
UAL1686 United Airlines 4 2026-07-24
UAL1652 - 4 2026-06-30
UAL1073 United Airlines 4 2026-07-14
UAL655 - 3 2026-06-23
UAL619 United Airlines 3 2026-06-11
UAL606 - 3 2026-07-04
UAL487 United Airlines 3 2026-07-20
UAL431 United Airlines 3 2026-04-16
UAL2610 United Airlines 3 2026-05-23
UAL2433 United Airlines 3 2026-07-23
UAL2173 United Airlines 3 2026-05-18
UAL2112 United Airlines 3 2026-07-25
UAL2102 - 3 2026-06-28
UAL2066 United Airlines 3 2026-07-25
UAL1981 United Airlines 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL395 EWR → SFO Jul 26, 20:10 UTCJul 26, 23:00 UTC2h 50m
2026-07-26 UAL1421 IAH → BWI Jul 26, 16:45 UTCJul 26, 18:45 UTC2h 0m
2026-07-26 UAL1825 EWR → SFO Jul 26, 13:00 UTCJul 26, 15:00 UTC2h 0m
2026-07-26 UAL1825 EWR → SFO Jul 26, 12:38 UTCJul 26, 15:12 UTC2h 34m
2026-07-26 UAL357 IAD → SFO Jul 26, 04:50 UTCJul 26, 09:20 UTC4h 31m
2026-07-26 UAL1302 EWR → BOS Jul 26, 02:20 UTCJul 26, 03:20 UTC1h 0m
2026-07-25 UAL1281 RNO → SFO Jul 25, 22:14 UTCJul 26, 00:05 UTC1h 51m
2026-07-25 UAL1281 RNO → SFO Jul 25, 22:15 UTCJul 26, 00:10 UTC1h 55m
2026-07-25 UAL1587 RSW → EWR Jul 25, 17:05 UTCJul 25, 20:20 UTC3h 15m
2026-07-25 UAL2066 ORD → PHL Jul 25, 15:05 UTCJul 25, 15:35 UTC30m
2026-07-25 UAL2112 JAX → EWR Jul 25, 12:40 UTCJul 25, 13:15 UTC35m
2026-07-25 UAL635 EWR → MSY Jul 25, 10:05 UTCJul 25, 11:00 UTC55m
2026-07-24 UAL516 SFO → LAX Jul 24, 23:55 UTCJul 25, 01:30 UTC1h 35m
2026-07-24 UAL2362 LGA → ORD Jul 24, 20:00 UTCJul 24, 21:35 UTC1h 35m
2026-07-24 UAL2333 ORD → SFO Jul 24, 14:10 UTCJul 24, 16:54 UTC2h 44m
2026-07-24 UAL2333 ORD → SFO Jul 24, 13:50 UTCJul 24, 16:05 UTC2h 15m
2026-07-24 UAL1686 IAH → SNA Jul 24, 02:25 UTCJul 24, 02:30 UTC5m
2026-07-23 UAL1686 IAH → SNA Jul 23, 23:20 UTCJul 24, 02:30 UTC3h 10m
2026-07-23 UAL1686 IAH → SNA Jul 23, 23:11 UTCJul 24, 02:06 UTC2h 55m
2026-07-23 UAL455 ORD → MSN Jul 23, 18:50 UTCJul 23, 21:55 UTC3h 5m
2026-07-23 UAL2124 PDX → SFO Jul 23, 14:50 UTCJul 23, 17:00 UTC2h 10m
2026-07-23 UAL320 DEN → BOS Jul 23, 11:30 UTCJul 23, 13:25 UTC1h 55m
2026-07-23 UAL2433 JAX → EWR Jul 23, 02:10 UTCJul 23, 06:10 UTC4h 0m
2026-07-22 UAL2466 SJC → DEN Jul 22, 21:25 UTCJul 22, 23:10 UTC1h 45m
2026-07-22 UAL2443 MSN → ORD Jul 22, 18:20 UTCJul 22, 19:20 UTC1h 0m
2026-07-22 UAL1641 IAD → SFO Jul 22, 03:21 UTCJul 22, 04:13 UTC52m
2026-07-22 UAL1641 IAD → SFO Jul 22, 03:30 UTCJul 22, 04:15 UTC45m
2026-07-21 UAL2106 IAH → EWR Jul 21, 22:10 UTCJul 22, 01:20 UTC3h 10m
2026-07-21 UAL1620 FLL → EWR Jul 21, 17:13 UTCJul 21, 19:45 UTC2h 32m
2026-07-21 UAL1620 FLL → EWR Jul 21, 17:10 UTCJul 21, 19:00 UTC1h 50m
2026-07-21 UAL1617 IAH → BOS Jul 21, 13:20 UTCJul 21, 15:40 UTC2h 20m
2026-07-21 UAL387 YVR → LAX Jul 21, 02:35 UTCJul 21, 05:30 UTC2h 55m
2026-07-21 UAL387 YVR → LAX Jul 21, 02:39 UTCJul 21, 05:29 UTC2h 50m
2026-07-20 UAL1743 - Jul 20, 21:45 UTCJul 21, 00:45 UTC2h 59m
2026-07-20 UAL1743 IAH → LAX Jul 20, 21:52 UTCJul 21, 00:34 UTC2h 42m
2026-07-20 UAL2498 - Jul 20, 16:30 UTCJul 20, 20:00 UTC3h 30m
2026-07-20 UAL487 PHX → SFO Jul 20, 10:30 UTCJul 20, 13:45 UTC3h 15m
2026-07-19 UAL2474 - Jul 19, 23:30 UTCJul 20, 01:35 UTC2h 5m
2026-07-19 UAL462 EWR → PBI Jul 19, 19:45 UTCJul 19, 21:45 UTC2h 0m
2026-07-19 UAL462 EWR → PBI Jul 19, 19:40 UTCJul 19, 21:45 UTC2h 5m
2026-07-19 UAL686 - Jul 19, 14:25 UTCJul 19, 17:55 UTC3h 30m
2026-07-19 UAL1575 MSP → EWR Jul 19, 02:45 UTCJul 19, 08:00 UTC5h 15m
2026-07-18 UAL2431 FLL → EWR Jul 18, 17:50 UTCJul 18, 23:00 UTC5h 10m
2026-07-18 UAL2647 - Jul 18, 13:20 UTCJul 18, 14:10 UTC50m
2026-07-18 UAL483 BNA → SFO Jul 18, 01:10 UTCJul 18, 03:55 UTC2h 46m
2026-07-17 UAL2815 - Jul 17, 20:10 UTCJul 17, 23:20 UTC3h 10m
2026-07-17 UAL2402 - Jul 17, 15:15 UTCJul 17, 18:15 UTC3h 0m
2026-07-17 UAL492 - Jul 17, 10:15 UTCJul 17, 13:10 UTC2h 55m
2026-07-17 UAL1444 - Jul 17, 01:39 UTCJul 17, 04:35 UTC2h 55m
2026-07-16 UAL1516 - Jul 16, 15:10 UTCJul 16, 23:15 UTC8h 5m

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 N68891 page for operator, model, and routing details .

Mode-S A9249C frequently asked

What is Mode-S code A9249C?
A9249C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N68891.
Where is Mode-S A9249C registered?
Mode-S code A9249C 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 A9249C broadcasting right now?
Yes. Mode-S A9249C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9249C, octal 52222234, decimal 11,084,956.
What flights does A9249C operate?
Mode-S A9249C has broadcast 20 distinct callsigns, including UAL1900, UAL1891, UAL1850, UAL427, UAL2255.