Apparatus

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sensors Mode-S transponder

A56A18

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N448UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A56A18
Octal
51265030
Decimal
10,840,600
Country
US
Tail
N448UA
Type
A320
Broadcasting now · callsign UAL797 · 28,925 ft
Flights observed
483
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Current position

A56A18 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A56A18 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
UAL1508 United Airlines 9 2026-07-21
UAL1515 - 8 2026-06-23
UAL817 United Airlines 7 2026-07-22
UAL2157 - 7 2026-07-03
UAL2192 United Airlines 6 2026-07-23
UAL1808 United Airlines 6 2026-07-25
UAL671 United Airlines 5 2026-07-26
UAL355 - 5 2026-06-23
UAL2778 - 5 2026-06-21
UAL2366 - 5 2026-07-03
UAL790 - 4 2026-07-05
UAL718 United Airlines 4 2026-07-22
UAL2656 - 4 2026-06-20
UAL2305 United Airlines 4 2026-07-26
UAL1846 - 4 2026-07-06
UAL1823 United Airlines 4 2026-05-30
UAL1747 United Airlines 4 2026-05-30
UAL1482 - 4 2026-07-17
UAL1438 - 4 2026-07-02
UAL1007 - 4 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2305 RSW → ORD Jul 26, 21:25 UTCJul 26, 22:00 UTC35m
2026-07-26 UAL671 DEN → BZN Jul 26, 17:55 UTCJul 26, 20:00 UTC2h 5m
2026-07-26 UAL2383 PHL → DEN Jul 26, 12:55 UTCJul 26, 16:05 UTC3h 10m
2026-07-26 UAL2671 IAD → SAT Jul 26, 00:05 UTCJul 26, 02:55 UTC2h 50m
2026-07-25 UAL1790 EWR → MYR Jul 25, 20:00 UTCJul 25, 22:00 UTC2h 0m
2026-07-25 UAL1578 IAH → LAX Jul 25, 18:00 UTCJul 25, 18:50 UTC50m
2026-07-25 UAL1808 CHS → EWR Jul 25, 12:20 UTCJul 25, 16:00 UTC3h 40m
2026-07-25 UAL1808 CHS → EWR Jul 25, 12:18 UTCJul 25, 15:57 UTC3h 39m
2026-07-24 UAL648 EWR → SFO Jul 24, 23:25 UTCJul 25, 02:25 UTC3h 0m
2026-07-24 UAL2279 EWR → MSY Jul 24, 20:30 UTCJul 24, 22:05 UTC1h 35m
2026-07-24 UAL1301 CLT → ORD Jul 24, 17:25 UTCJul 24, 18:35 UTC1h 10m
2026-07-23 UAL737 CLE → EWR Jul 23, 23:05 UTCJul 24, 01:00 UTC1h 55m
2026-07-23 UAL2192 PHL → ORD Jul 23, 18:15 UTCJul 23, 19:40 UTC1h 25m
2026-07-23 UAL1293 - Jul 23, 12:00 UTCJul 23, 16:15 UTC4h 15m
2026-07-22 UAL499 DEN → EWR Jul 22, 19:55 UTCJul 22, 23:55 UTC4h 0m
2026-07-22 UAL499 DEN → EWR Jul 22, 19:36 UTCJul 22, 23:53 UTC4h 17m
2026-07-22 UAL718 MEX → SFO Jul 22, 14:00 UTCJul 22, 17:45 UTC3h 45m
2026-07-22 UAL817 DEL → EWR Jul 22, 02:35 UTCJul 22, 02:40 UTC5m
2026-07-21 UAL817 DEL → EWR Jul 21, 22:29 UTCJul 22, 02:38 UTC4h 9m
2026-07-21 UAL817 DEL → EWR Jul 21, 22:35 UTCJul 22, 00:35 UTC2h 0m
2026-07-21 UAL2386 EWR → TPA Jul 21, 18:20 UTCJul 21, 19:10 UTC50m
2026-07-21 UAL2363 PHL → ORD Jul 21, 15:55 UTCJul 21, 16:50 UTC55m
2026-07-21 UAL335 DEN → IAD Jul 21, 13:05 UTCJul 21, 14:20 UTC1h 15m
2026-07-21 UAL335 DEN → IAD Jul 21, 13:13 UTCJul 21, 14:17 UTC1h 4m
2026-07-21 UAL1508 IAD → EWR Jul 21, 05:30 UTCJul 21, 06:30 UTC1h 0m
2026-07-21 UAL1508 IAD → EWR Jul 21, 03:35 UTCJul 21, 04:30 UTC55m
2026-07-20 UAL2764 IAD → EWR Jul 20, 23:40 UTCJul 21, 00:35 UTC55m
2026-07-20 UAL2305 RSW → ORD Jul 20, 21:40 UTCJul 20, 22:25 UTC45m
2026-07-20 UAL671 DEN → BZN Jul 20, 17:45 UTCJul 20, 19:40 UTC1h 55m
2026-07-20 UAL255 ATW → DEN Jul 20, 14:00 UTCJul 20, 16:05 UTC2h 5m
2026-07-20 UAL1204 DEN → ATW Jul 20, 00:55 UTCJul 20, 02:45 UTC1h 50m
2026-07-19 UAL1866 FLL → EWR Jul 19, 20:25 UTCJul 19, 23:05 UTC2h 40m
2026-07-19 UAL1786 - Jul 19, 16:35 UTCJul 19, 19:10 UTC2h 35m
2026-07-19 UAL1003 - Jul 19, 13:45 UTCJul 19, 14:10 UTC25m
2026-07-19 UAL1483 - Jul 19, 01:25 UTCJul 19, 01:45 UTC20m
2026-07-18 UAL637 MSY → DEN Jul 18, 20:55 UTCJul 19, 00:05 UTC3h 10m
2026-07-18 UAL637 MSY → DEN Jul 18, 20:59 UTCJul 19, 00:02 UTC3h 3m
2026-07-18 UAL493 - Jul 18, 16:30 UTCJul 18, 19:20 UTC2h 50m
2026-07-18 UAL2329 SBP → DEN Jul 18, 12:55 UTCJul 18, 15:00 UTC2h 5m
2026-07-18 UAL1237 DEN → SBP Jul 18, 01:25 UTCJul 18, 03:40 UTC2h 16m
2026-07-17 UAL531 JAC → DEN Jul 17, 22:43 UTCJul 17, 23:40 UTC57m
2026-07-17 UAL1537 - Jul 17, 20:15 UTCJul 17, 20:44 UTC30m
2026-07-17 UAL1505 SEA → DEN Jul 17, 16:04 UTCJul 17, 18:19 UTC2h 15m
2026-07-17 UAL1482 DEN → SEA Jul 17, 12:15 UTCJul 17, 14:39 UTC2h 25m
2026-07-16 UAL2049 DFW → DEN Jul 16, 17:00 UTCJul 16, 18:29 UTC1h 30m
2026-07-16 UAL2160 DEN → DFW Jul 16, 13:49 UTCJul 16, 15:19 UTC1h 30m
2026-07-14 UAL1829 - Jul 14, 18:00 UTCJul 14, 18:30 UTC30m
2026-07-14 UAL2847 - Jul 14, 14:10 UTCJul 14, 15:35 UTC1h 25m
2026-07-14 UAL2847 ORD → RAP Jul 14, 14:15 UTCJul 14, 15:51 UTC1h 36m
2026-07-14 UAL1148 - Jul 14, 08:05 UTCJul 14, 11:40 UTC3h 35m

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 N448UA page for operator, model, and routing details .

Mode-S A56A18 frequently asked

What is Mode-S code A56A18?
A56A18 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N448UA.
Where is Mode-S A56A18 registered?
Mode-S code A56A18 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 A56A18 broadcasting right now?
Yes. Mode-S A56A18 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A56A18, octal 51265030, decimal 10,840,600.
What flights does A56A18 operate?
Mode-S A56A18 has broadcast 20 distinct callsigns, including UAL1508, UAL1515, UAL817, UAL2157, UAL2192.