Apparatus

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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
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
399
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A6C248.

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 8 2026-07-23
UAL1813 - 6 2026-06-25
UAL2690 - 5 2026-07-17
UAL2014 United Airlines 5 2026-07-23
UAL1014 - 5 2026-07-11
UAL2207 - 4 2026-06-24
UAL1056 - 4 2026-07-11
UAL1033 - 4 2026-07-15
UAL1010 - 4 2026-07-02
UAL785 - 3 2026-06-24
UAL395 United Airlines 3 2026-05-03
UAL2347 United Airlines 3 2026-07-21
UAL2336 United Airlines 3 2026-06-06
UAL1982 United Airlines 3 2026-06-02
UAL1748 - 3 2026-07-19
UAL1475 United Airlines 3 2026-07-24
UAL1401 - 3 2026-07-06
UAL8207 United Airlines 2 2026-05-07
UAL8205 United Airlines 2 2026-06-04
UAL8169 United Airlines 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1405 BZE → IAH Jul 26, 19:10 UTCJul 26, 21:00 UTC1h 50m
2026-07-26 UAL1408 IAH → BZE Jul 26, 15:50 UTCJul 26, 17:35 UTC1h 45m
2026-07-26 UAL1408 IAH → BZE Jul 26, 15:35 UTCJul 26, 17:54 UTC2h 19m
2026-07-25 UAL1164 MBJ → IAH Jul 25, 17:50 UTCJul 26, 00:40 UTC6h 50m
2026-07-25 UAL722 ORD → FLL Jul 25, 13:15 UTCJul 25, 15:15 UTC2h 0m
2026-07-25 UAL722 ORD → FLL Jul 25, 13:17 UTCJul 25, 15:11 UTC1h 54m
2026-07-24 UAL277 IAD → SFO Jul 24, 21:45 UTCJul 24, 23:50 UTC2h 5m
2026-07-24 UAL1964 IAD → SEA Jul 24, 17:15 UTCJul 24, 19:35 UTC2h 20m
2026-07-24 UAL1964 IAD → SEA Jul 24, 17:27 UTCJul 24, 19:33 UTC2h 6m
2026-07-24 UAL2607 DFW → EWR Jul 24, 12:50 UTCJul 24, 15:05 UTC2h 15m
2026-07-24 UAL1475 EWR → RSW Jul 24, 00:30 UTCJul 24, 02:25 UTC1h 55m
2026-07-23 UAL8116 SFO → EWR Jul 23, 19:10 UTCJul 23, 20:15 UTC1h 5m
2026-07-23 UAL605 SFO → PDX Jul 23, 15:30 UTCJul 23, 17:40 UTC2h 10m
2026-07-23 UAL1782 BOI → DEN Jul 23, 12:45 UTCJul 23, 14:15 UTC1h 30m
2026-07-23 UAL2014 DEN → SDF Jul 23, 04:05 UTCJul 23, 05:35 UTC1h 30m
2026-07-22 UAL2173 MYR → ORD Jul 22, 23:50 UTCJul 23, 01:20 UTC1h 30m
2026-07-22 UAL2173 MYR → ORD Jul 22, 23:46 UTCJul 23, 01:29 UTC1h 43m
2026-07-22 UAL2255 MSO → DEN Jul 22, 18:00 UTCJul 22, 19:30 UTC1h 30m
2026-07-22 UAL2360 IAD → SYR Jul 22, 13:55 UTCJul 22, 16:10 UTC2h 15m
2026-07-22 UAL2360 IAD → SYR Jul 22, 14:07 UTCJul 22, 15:59 UTC1h 52m
2026-07-22 UAL1894 SAT → ORD Jul 22, 00:30 UTCJul 22, 02:15 UTC1h 45m
2026-07-21 UAL1412 TPA → EWR Jul 21, 20:20 UTCJul 21, 22:25 UTC2h 5m
2026-07-21 UAL2322 IAH → CMH Jul 21, 18:10 UTCJul 21, 18:55 UTC45m
2026-07-21 UAL2209 PBI → EWR Jul 21, 14:55 UTCJul 21, 16:25 UTC1h 30m
2026-07-21 UAL2347 SNA → ORD Jul 21, 06:25 UTCJul 21, 07:10 UTC45m
2026-07-21 UAL2347 SNA → ORD Jul 21, 06:14 UTCJul 21, 07:03 UTC49m
2026-07-21 UAL2347 SNA → ORD Jul 21, 02:40 UTCJul 21, 04:20 UTC1h 40m
2026-07-20 UAL1334 EWR → PBI Jul 20, 21:10 UTCJul 21, 01:05 UTC3h 54m
2026-07-20 UAL1410 IAH → PHL Jul 20, 16:50 UTCJul 20, 17:45 UTC55m
2026-07-20 UAL1803 CHS → EWR Jul 20, 14:30 UTCJul 20, 14:56 UTC26m
2026-07-20 UAL1803 CHS → EWR Jul 20, 14:10 UTCJul 20, 15:00 UTC50m
2026-07-20 UAL2483 ORD → PDX Jul 20, 10:10 UTCJul 20, 11:25 UTC1h 15m
2026-07-19 UAL2827 ORD → TYS Jul 19, 23:20 UTCJul 20, 00:30 UTC1h 10m
2026-07-19 UAL1748 - Jul 19, 18:25 UTCJul 19, 21:30 UTC3h 5m
2026-07-19 UAL659 EWR → IAD Jul 19, 15:55 UTCJul 19, 16:55 UTC1h 0m
2026-07-19 UAL2110 - Jul 19, 11:40 UTCJul 19, 14:30 UTC2h 50m
2026-07-19 UAL2110 IAH → LAX Jul 19, 11:41 UTCJul 19, 14:22 UTC2h 41m
2026-07-18 UAL2438 - Jul 18, 11:40 UTCJul 18, 14:35 UTC2h 55m
2026-07-18 UAL8244 - Jul 18, 01:10 UTCJul 18, 04:15 UTC3h 6m
2026-07-17 UAL1591 - Jul 17, 20:29 UTCJul 17, 23:25 UTC2h 55m
2026-07-17 UAL2367 - Jul 17, 18:10 UTCJul 17, 19:05 UTC55m
2026-07-17 UAL2367 SFO → LAX Jul 17, 17:45 UTCJul 17, 19:00 UTC1h 15m
2026-07-17 UAL2274 - Jul 17, 15:20 UTCJul 17, 16:24 UTC1h 5m
2026-07-17 UAL2690 - Jul 17, 01:59 UTCJul 17, 04:44 UTC2h 45m
2026-07-17 UAL2690 IAH → SAN Jul 17, 02:01 UTCJul 17, 04:40 UTC2h 39m
2026-07-16 UAL2078 - Jul 16, 20:25 UTCJul 17, 00:04 UTC3h 40m
2026-07-16 UAL1882 - Jul 16, 15:25 UTCJul 16, 18:55 UTC3h 30m
2026-07-16 UAL1882 IAH → SJC Jul 16, 15:24 UTCJul 16, 18:48 UTC3h 24m
2026-07-16 UAL2124 - Jul 16, 12:09 UTCJul 16, 13:00 UTC50m
2026-07-16 UAL1696 - Jul 16, 02:30 UTCJul 16, 03:15 UTC45m

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?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
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, UAL1813, UAL2690, UAL2014, UAL1014.