Apparatus

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sensors Mode-S transponder

AA56B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76516 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA56B5
Octal
52453265
Decimal
11,163,317
Country
US
Tail
N76516
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
420
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S AA56B5.

Country allocation

The ICAO 24-bit address AA56B5 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
UAL325 United Airlines 5 2026-07-23
UAL2199 United Airlines 5 2026-07-07
UAL600 United Airlines 4 2026-05-12
UAL2668 - 4 2026-07-13
UAL2257 - 4 2026-04-13
UAL2159 - 4 2026-06-18
UAL1816 - 4 2026-06-18
UAL1781 United Airlines 4 2026-06-02
UAL1325 - 4 2026-07-13
UAL1311 United Airlines 4 2026-06-01
UAL708 - 3 2026-06-18
UAL669 - 3 2026-07-07
UAL645 - 3 2026-06-15
UAL480 United Airlines 3 2026-07-24
UAL2652 - 3 2026-07-18
UAL2156 United Airlines 3 2026-06-28
UAL2098 - 3 2026-06-19
UAL204 United Airlines 3 2026-05-05
UAL1910 - 3 2026-07-01
UAL1851 - 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1185 LAX → SJD Jul 26, 16:15 UTCJul 26, 21:15 UTC5h 0m
2026-07-26 UAL2096 LAX → EWR Jul 26, 13:05 UTCJul 26, 14:15 UTC1h 10m
2026-07-26 UAL2238 IAH → SFO Jul 26, 04:00 UTCJul 26, 04:50 UTC50m
2026-07-25 UAL741 LAS → EWR Jul 25, 20:10 UTCJul 26, 02:50 UTC6h 40m
2026-07-25 UAL2487 RSW → EWR Jul 25, 17:15 UTCJul 25, 18:15 UTC1h 0m
2026-07-25 UAL1481 EWR → CLT Jul 25, 14:20 UTCJul 25, 15:45 UTC1h 25m
2026-07-24 UAL1389 CMH → DEN Jul 24, 19:40 UTCJul 24, 22:20 UTC2h 40m
2026-07-24 UAL480 DFW → EWR Jul 24, 15:50 UTCJul 24, 18:05 UTC2h 15m
2026-07-24 UAL621 JAX → EWR Jul 24, 13:10 UTCJul 24, 14:05 UTC55m
2026-07-24 UAL484 DEN → LAS Jul 24, 02:55 UTCJul 24, 04:00 UTC1h 5m
2026-07-23 UAL325 DEN → BOS Jul 23, 23:20 UTCJul 24, 01:30 UTC2h 10m
2026-07-23 UAL325 DEN → BOS Jul 23, 23:08 UTCJul 24, 01:26 UTC2h 18m
2026-07-23 UAL325 DEN → BOS Jul 23, 19:00 UTCJul 23, 21:05 UTC2h 5m
2026-07-23 UAL1896 SEA → SFO Jul 23, 16:35 UTCJul 23, 17:30 UTC55m
2026-07-23 UAL1604 SFO → BNA Jul 23, 14:15 UTCJul 23, 15:15 UTC1h 0m
2026-07-23 UAL1704 EWR → MSP Jul 23, 02:40 UTCJul 23, 04:35 UTC1h 55m
2026-07-22 UAL2239 DEN → SFO Jul 22, 19:40 UTCJul 22, 23:40 UTC4h 0m
2026-07-22 UAL2195 ORD → IAH Jul 22, 16:20 UTCJul 22, 17:55 UTC1h 35m
2026-07-22 UAL1355 IAD → EWR Jul 22, 13:10 UTCJul 22, 14:25 UTC1h 15m
2026-07-21 UAL717 MFR → SFO Jul 21, 17:50 UTCJul 21, 21:45 UTC3h 55m
2026-07-21 UAL565 YYZ → SFO Jul 21, 11:30 UTCJul 21, 16:30 UTC5h 0m
2026-07-21 UAL1649 SFO → CMH Jul 21, 03:50 UTCJul 21, 04:50 UTC1h 0m
2026-07-21 UAL1649 SFO → CMH Jul 21, 03:18 UTCJul 21, 04:49 UTC1h 31m
2026-07-20 UAL1098 EWR → DEN Jul 20, 23:05 UTCJul 21, 01:00 UTC1h 54m
2026-07-20 UAL1821 PHL → ORD Jul 20, 19:40 UTCJul 20, 21:20 UTC1h 40m
2026-07-20 UAL503 RDU → EWR Jul 20, 14:55 UTCJul 20, 17:05 UTC2h 10m
2026-07-20 UAL1186 DFW → ORD Jul 20, 11:40 UTCJul 20, 13:30 UTC1h 50m
2026-07-19 UAL433 - Jul 19, 21:10 UTCJul 19, 23:00 UTC1h 50m
2026-07-19 UAL1554 SJC → DEN Jul 19, 18:18 UTCJul 19, 19:32 UTC1h 14m
2026-07-19 UAL1554 SJC → DEN Jul 19, 18:10 UTCJul 19, 19:35 UTC1h 25m
2026-07-19 UAL2771 - Jul 19, 15:05 UTCJul 19, 16:45 UTC1h 40m
2026-07-19 UAL8148 ORD → SAT Jul 19, 04:30 UTCJul 19, 05:50 UTC1h 20m
2026-07-19 UAL8148 ORD → SAT Jul 19, 04:42 UTCJul 19, 05:51 UTC1h 9m
2026-07-18 UAL1180 - Jul 18, 14:35 UTCJul 19, 02:15 UTC11h 40m
2026-07-18 UAL490 - Jul 18, 11:15 UTCJul 18, 12:10 UTC55m
2026-07-18 UAL2652 - Jul 18, 01:20 UTCJul 18, 02:09 UTC50m
2026-07-17 UAL2160 PHX → SFO Jul 17, 21:50 UTCJul 17, 23:45 UTC1h 55m
2026-07-17 UAL441 ORD → DFW Jul 17, 16:04 UTCJul 17, 17:50 UTC1h 45m
2026-07-17 UAL1355 - Jul 17, 13:10 UTCJul 17, 14:04 UTC55m
2026-07-13 UAL2652 ORD → CLE Jul 13, 23:18 UTCJul 13, 23:54 UTC36m
2026-07-13 UAL2652 ORD → CLE Jul 13, 23:05 UTCJul 13, 23:55 UTC50m
2026-07-13 UAL1325 DCA → ORD Jul 13, 19:50 UTCJul 13, 21:20 UTC1h 30m
2026-07-13 UAL2668 - Jul 13, 16:35 UTCJul 13, 18:05 UTC1h 30m
2026-07-11 UAL590 - Jul 11, 21:40 UTCJul 11, 23:25 UTC1h 45m
2026-07-11 UAL1720 - Jul 11, 17:20 UTCJul 11, 20:10 UTC2h 50m
2026-07-11 UAL1645 - Jul 11, 12:15 UTCJul 11, 14:55 UTC2h 40m
2026-07-11 UAL1790 DEN → CLE Jul 11, 01:25 UTCJul 11, 03:50 UTC2h 25m
2026-07-10 UAL730 COS → DEN Jul 10, 20:25 UTCJul 10, 20:50 UTC25m
2026-07-10 UAL1111 DEN → COS Jul 10, 18:55 UTCJul 10, 19:15 UTC20m
2026-07-10 UAL2412 - Jul 10, 14:10 UTCJul 10, 17:40 UTC3h 30m

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 N76516 page for operator, model, and routing details .

Mode-S AA56B5 frequently asked

What is Mode-S code AA56B5?
AA56B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76516.
Where is Mode-S AA56B5 registered?
Mode-S code AA56B5 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 AA56B5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA56B5, octal 52453265, decimal 11,163,317.
What flights does AA56B5 operate?
Mode-S AA56B5 has broadcast 20 distinct callsigns, including UAL325, UAL2199, UAL600, UAL2668, UAL2257.