Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6C247

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N53441 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A6C247
Octal
51541107
Decimal
10,928,711
Country
US
Tail
N53441
Type
B739
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
338
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S A6C247.

Country allocation

The ICAO 24-bit address A6C247 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
UAL2247 United Airlines 4 2026-06-19
UAL1895 - 4 2026-07-15
UAL1864 - 4 2026-07-23
UAL1154 - 4 2026-06-25
UAL794 United Airlines 3 2026-07-26
UAL765 United Airlines 3 2026-05-04
UAL622 United Airlines 3 2026-07-26
UAL3898 United Airlines 3 2026-04-13
UAL2444 United Airlines 3 2026-05-04
UAL2333 - 3 2026-06-26
UAL2136 United Airlines 3 2026-05-14
UAL1379 - 3 2026-07-01
UAL1275 United Airlines 3 2026-06-11
UAL1198 United Airlines 3 2026-06-11
UAL1196 United Airlines 3 2026-06-25
UAL1190 - 3 2026-07-15
UAL8161 - 2 2026-07-09
UAL8105 - 2 2026-07-12
UAL752 United Airlines 2 2026-05-26
UAL664 - 2 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL794 EWR → SAN Jul 26, 18:35 UTCJul 26, 20:40 UTC2h 5m
2026-07-26 UAL622 LAX → ORD Jul 26, 15:25 UTCJul 26, 16:15 UTC50m
2026-07-26 UAL622 LAX → ORD Jul 26, 15:17 UTCJul 26, 16:19 UTC1h 2m
2026-07-26 UAL2779 FRA → SFO Jul 26, 12:35 UTCJul 26, 13:25 UTC50m
2026-07-26 UAL1490 SFO → BOI Jul 26, 06:50 UTCJul 26, 10:00 UTC3h 10m
2026-07-26 UAL2738 IAD → EWR Jul 26, 01:15 UTCJul 26, 05:05 UTC3h 50m
2026-07-25 UAL1673 CLE → ORD Jul 25, 22:15 UTCJul 25, 23:10 UTC55m
2026-07-25 UAL1502 EWR → ORD Jul 25, 19:55 UTCJul 25, 20:45 UTC50m
2026-07-25 UAL2370 PHL → ORD Jul 25, 14:10 UTCJul 25, 17:50 UTC3h 40m
2026-07-24 UAL1920 EUG → SFO Jul 24, 22:05 UTCJul 25, 01:45 UTC3h 40m
2026-07-24 UAL2443 MSN → ORD Jul 24, 18:20 UTCJul 24, 19:15 UTC55m
2026-07-24 UAL2443 MSN → ORD Jul 24, 18:16 UTCJul 24, 18:57 UTC41m
2026-07-24 UAL2389 LGA → ORD Jul 24, 15:40 UTCJul 24, 16:30 UTC50m
2026-07-24 UAL2420 RSW → IAH Jul 24, 11:40 UTCJul 24, 13:35 UTC1h 55m
2026-07-24 UAL1761 SAN → SFO Jul 24, 01:30 UTCJul 24, 03:15 UTC1h 45m
2026-07-23 UAL1813 CVG → ORD Jul 23, 22:30 UTCJul 23, 23:20 UTC50m
2026-07-23 UAL2370 PHL → ORD Jul 23, 20:20 UTCJul 23, 21:05 UTC45m
2026-07-23 UAL1875 FLL → EWR Jul 23, 15:55 UTCJul 23, 17:50 UTC1h 55m
2026-07-23 UAL1864 - Jul 23, 11:20 UTCJul 23, 13:45 UTC2h 25m
2026-07-23 UAL1864 MIA → EWR Jul 23, 11:22 UTCJul 23, 14:03 UTC2h 41m
2026-07-23 UAL1128 SFO → EWR Jul 23, 00:40 UTCJul 23, 03:20 UTC2h 40m
2026-07-22 UAL2796 JAX → EWR Jul 22, 21:00 UTCJul 22, 22:55 UTC1h 55m
2026-07-22 UAL2678 ORD → SFO Jul 22, 17:15 UTCJul 22, 19:25 UTC2h 10m
2026-07-22 UAL2301 PHL → ORD Jul 22, 14:05 UTCJul 22, 15:30 UTC1h 25m
2026-07-20 UAL1046 ATL → ORD Jul 20, 23:20 UTCJul 21, 00:37 UTC1h 17m
2026-07-20 UAL1046 ATL → ORD Jul 20, 23:15 UTCJul 21, 00:55 UTC1h 39m
2026-07-20 UAL356K - Jul 20, 19:35 UTCJul 20, 21:00 UTC1h 25m
2026-07-20 UAL664 LAS → ORD Jul 20, 14:21 UTCJul 20, 17:39 UTC3h 18m
2026-07-20 UAL664 LAS → ORD Jul 20, 14:25 UTCJul 20, 17:45 UTC3h 20m
2026-07-19 UAL2658 IAH → MCO Jul 19, 22:45 UTCJul 20, 01:20 UTC2h 35m
2026-07-19 UAL2421 - Jul 19, 16:10 UTCJul 19, 18:05 UTC1h 55m
2026-07-19 UAL1353 - Jul 19, 12:45 UTCJul 19, 14:45 UTC2h 0m
2026-07-19 UAL2840 LAS → IAH Jul 19, 08:20 UTCJul 19, 10:55 UTC2h 35m
2026-07-19 UAL8101 - Jul 19, 01:35 UTCJul 19, 04:05 UTC2h 30m
2026-07-18 UAL743 - Jul 18, 20:10 UTCJul 18, 23:25 UTC3h 15m
2026-07-18 UAL1348 - Jul 18, 14:50 UTCJul 18, 17:55 UTC3h 5m
2026-07-18 UAL1348 IAH → RNO Jul 18, 14:50 UTCJul 18, 17:58 UTC3h 8m
2026-07-18 UAL2215 FLL → EWR Jul 18, 04:00 UTCJul 18, 06:00 UTC2h 0m
2026-07-18 UAL496 - Jul 18, 00:50 UTCJul 18, 02:45 UTC1h 55m
2026-07-17 UAL1867 - Jul 17, 21:00 UTCJul 17, 22:49 UTC1h 50m
2026-07-17 UAL1867 CZM → IAH Jul 17, 21:03 UTCJul 17, 22:43 UTC1h 40m
2026-07-17 UAL1919 - Jul 17, 17:30 UTCJul 17, 19:15 UTC1h 45m
2026-07-16 UAL1545 - Jul 16, 19:25 UTCJul 16, 21:50 UTC2h 25m
2026-07-16 UAL2067 - Jul 16, 15:35 UTCJul 16, 17:49 UTC2h 15m
2026-07-16 UAL1897 EWR → FLL Jul 16, 01:45 UTCJul 16, 04:00 UTC2h 15m
2026-07-15 UAL1190 PHX → EWR Jul 15, 19:10 UTCJul 15, 23:45 UTC4h 35m
2026-07-15 UAL1895 - Jul 15, 15:00 UTCJul 15, 17:20 UTC2h 20m
2026-07-15 UAL1895 IAH → PHX Jul 15, 15:00 UTCJul 15, 17:18 UTC2h 18m
2026-07-14 UAL2608 - Jul 14, 14:45 UTCJul 14, 17:30 UTC2h 45m
2026-07-14 UAL1995 SFO → LAS Jul 14, 04:35 UTCJul 14, 05:40 UTC1h 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 N53441 page for operator, model, and routing details .

Mode-S A6C247 frequently asked

What is Mode-S code A6C247?
A6C247 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N53441.
Where is Mode-S A6C247 registered?
Mode-S code A6C247 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 A6C247 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6C247, octal 51541107, decimal 10,928,711.
What flights does A6C247 operate?
Mode-S A6C247 has broadcast 20 distinct callsigns, including UAL2247, UAL1895, UAL1864, UAL1154, UAL794.