Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6C248

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N53442 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A6C248
Octal
51541110
Decimal
10,928,712
Country
US
Tail
N53442
Type
B739
Broadcasting now · callsign UAL1500 · 36,000 ft
Flights observed
188
Distinct callsigns
20
Country
US
Last broadcast
13h ago

Current position

A6C248 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6C248 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
UAL1782 United Airlines 4 2026-05-11
UAL395 United Airlines 3 2026-05-03
UAL2014 United Airlines 3 2026-05-11
UAL1982 United Airlines 3 2026-06-02
UAL8207 United Airlines 2 2026-05-07
UAL8205 United Airlines 2 2026-06-04
UAL8169 United Airlines 2 2026-05-21
UAL8108 United Airlines 2 2026-05-01
UAL8107 United Airlines 2 2026-05-05
UAL688 United Airlines 2 2026-05-14
UAL572 United Airlines 2 2026-04-28
UAL524 United Airlines 2 2026-05-20
UAL473 United Airlines 2 2026-05-28
UAL403 United Airlines 2 2026-05-24
UAL3880 United Airlines 2 2026-04-21
UAL342 United Airlines 2 2026-05-09
UAL279 United Airlines 2 2026-05-24
UAL274 United Airlines 2 2026-04-28
UAL2738 United Airlines 2 2026-05-04
UAL2690 United Airlines 2 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-05 UAL2324 GEG → SFO Jun 5, 00:10 UTCJun 5, 01:45 UTC1h 35m
2026-06-04 UAL1126 LAS → EWR Jun 4, 18:50 UTCJun 4, 22:05 UTC3h 15m
2026-06-04 UAL1101 MCO → EWR Jun 4, 14:18 UTCJun 4, 17:16 UTC2h 58m
2026-06-04 UAL1101 MCO → EWR Jun 4, 14:20 UTCJun 4, 17:20 UTC3h 0m
2026-06-04 UAL1442 IAH → EWR Jun 4, 11:15 UTCJun 4, 12:25 UTC1h 10m
2026-06-04 UAL8205 ORD → CMH Jun 4, 03:50 UTCJun 4, 04:55 UTC1h 5m
2026-06-04 UAL8205 ORD → CMH Jun 4, 03:53 UTCJun 4, 04:55 UTC1h 2m
2026-06-04 UAL682 EWR → SFO Jun 4, 00:40 UTCJun 4, 02:35 UTC1h 55m
2026-06-03 UAL1302 EWR → BOS Jun 3, 19:50 UTCJun 3, 21:50 UTC2h 0m
2026-06-03 UAL597 EWR → LAS Jun 3, 16:35 UTCJun 3, 18:00 UTC1h 25m
2026-06-03 UAL1729 DEN → EWR Jun 3, 02:00 UTCJun 3, 03:25 UTC1h 25m
2026-06-02 UAL1238 EWR → MIA Jun 2, 20:10 UTCJun 2, 23:55 UTC3h 45m
2026-06-02 UAL1982 ORD → LGA Jun 2, 16:35 UTCJun 2, 18:45 UTC2h 10m
2026-06-02 UAL1982 ORD → LGA Jun 2, 16:47 UTCJun 2, 18:46 UTC1h 59m
2026-06-02 UAL2685 MID → IAH Jun 2, 14:20 UTCJun 2, 15:10 UTC50m
2026-06-02 UAL2685 MID → IAH Jun 2, 13:12 UTCJun 2, 14:56 UTC1h 44m
2026-06-01 UAL1426 IAH → MID Jun 1, 22:25 UTCJun 1, 22:45 UTC20m
2026-06-01 UAL1426 IAH → MID Jun 1, 22:26 UTCJun 1, 23:55 UTC1h 29m
2026-06-01 UAL2296 SFO → IAH Jun 1, 19:40 UTCJun 1, 20:35 UTC55m
2026-06-01 UAL2385 IAH → SFO Jun 1, 17:15 UTCJun 1, 18:05 UTC50m
2026-06-01 UAL2385 IAH → SFO Jun 1, 17:12 UTCJun 1, 18:00 UTC48m
2026-06-01 UAL1059 CUN → IAH Jun 1, 14:25 UTCJun 1, 15:05 UTC40m
2026-06-01 UAL1075 SFO → ORD Jun 1, 07:05 UTCJun 1, 10:00 UTC2h 55m
2026-06-01 UAL2240 ONT → SFO Jun 1, 00:28 UTCJun 1, 02:22 UTC1h 54m
2026-06-01 UAL2240 ONT → SFO Jun 1, 00:25 UTCJun 1, 02:30 UTC2h 5m
2026-05-31 UAL2120 MFE → IAH May 31, 19:05 UTCMay 31, 23:00 UTC3h 55m
2026-05-31 UAL2640 FLL → EWR May 31, 14:10 UTCMay 31, 17:30 UTC3h 20m
2026-05-30 UAL2288 IAH → LAS May 30, 20:40 UTCMay 31, 00:20 UTC3h 40m
2026-05-30 UAL2269 DEN → RDU May 30, 16:10 UTCMay 30, 19:15 UTC3h 5m
2026-05-30 UAL1347 SAT → IAD May 30, 02:06 UTCMay 30, 13:55 UTC11h 49m
2026-05-29 UAL2816 HKG → ORD May 29, 19:40 UTCMay 29, 23:30 UTC3h 50m
2026-05-29 UAL1982 ORD → LGA May 29, 15:40 UTCMay 29, 17:45 UTC2h 5m
2026-05-28 UAL1165 SJD → IAH May 28, 18:00 UTCMay 28, 19:25 UTC1h 25m
2026-05-28 UAL473 IAH → SJC May 28, 13:10 UTCMay 28, 14:25 UTC1h 15m
2026-05-28 UAL473 IAH → SJC May 28, 13:16 UTCMay 28, 15:30 UTC2h 14m
2026-05-26 UAL1033 PTY → IAH May 26, 15:54 UTCMay 27, 01:05 UTC9h 10m
2026-05-26 UAL1475 EWR → RSW May 26, 02:00 UTCMay 26, 04:04 UTC2h 5m
2026-05-26 UAL1475 EWR → RSW May 26, 02:02 UTCMay 26, 04:04 UTC2h 2m
2026-05-25 UAL1813 CVG → ORD May 25, 23:00 UTCMay 26, 00:00 UTC1h 0m
2026-05-25 UAL1813 CVG → ORD May 25, 22:57 UTCMay 25, 23:49 UTC52m
2026-05-25 UAL1129 EWR → SEA May 25, 20:30 UTCMay 25, 21:15 UTC45m
2026-05-25 UAL1401 AUS → SFO May 25, 17:10 UTCMay 25, 19:00 UTC1h 50m
2026-05-25 UAL1401 AUS → SFO May 25, 17:15 UTCMay 25, 18:43 UTC1h 28m
2026-05-25 UAL2471 SAN → EWR May 25, 13:05 UTCMay 25, 15:45 UTC2h 40m
2026-05-25 UAL635 EWR → MSY May 25, 10:10 UTCMay 25, 11:10 UTC1h 0m
2026-05-25 UAL516 SFO → LAX May 25, 03:15 UTCMay 25, 04:45 UTC1h 30m
2026-05-24 UAL403 LAX → ITO May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 UAL279 CLT → EWR May 24, 17:00 UTCMay 24, 19:40 UTC2h 40m
2026-05-24 UAL752 LAX → IAH May 24, 11:25 UTCMay 24, 14:30 UTC3h 5m
2026-05-23 UAL1379 ORD → EWR May 23, 22:00 UTCMay 24, 00:10 UTC2h 10m

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 N53442 page for operator, model, and routing details .

Mode-S A6C248 frequently asked

What is Mode-S code A6C248?
A6C248 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N53442.
Where is Mode-S A6C248 registered?
Mode-S code A6C248 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 A6C248 broadcasting right now?
Yes. Mode-S A6C248 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6C248, octal 51541110, decimal 10,928,712.
What flights does A6C248 operate?
Mode-S A6C248 has broadcast 20 distinct callsigns, including UAL1782, UAL395, UAL2014, UAL1982, UAL8207.