Apparatus

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sensors Mode-S transponder

AAF27C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N804UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AAF27C
Octal
52571174
Decimal
11,203,196
Country
US
Tail
N804UA
Type
A319
No current signal · last broadcast Jul 26, 18:30 UTC
Flights observed
450
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:30 UTC

Last known position

Most recent position reported by Mode-S AAF27C.

Country allocation

The ICAO 24-bit address AAF27C 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
UAL2033 United Airlines 10 2026-07-23
UAL2045 United Airlines 8 2026-07-23
UAL1282 United Airlines 8 2026-07-24
UAL298 United Airlines 7 2026-05-15
UAL1871 - 6 2026-07-14
UAL1060 - 6 2026-07-09
UAL657 - 5 2026-07-11
UAL616 - 5 2026-06-14
UAL428 United Airlines 5 2026-05-17
UAL412 - 5 2026-07-05
UAL2470 United Airlines 5 2026-07-21
UAL2130 United Airlines 5 2026-07-20
UAL1963 United Airlines 5 2026-06-15
UAL1899 - 5 2026-07-13
UAL1371 United Airlines 5 2026-05-16
UAL1085 - 5 2026-07-09
UAL537 United Airlines 4 2026-07-03
UAL2385 United Airlines 4 2026-05-14
UAL2296 United Airlines 4 2026-05-14
UAL2115 United Airlines 4 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2115 MIA → EWR Jul 26, 17:35 UTCJul 26, 18:30 UTC55m
2026-07-26 UAL2115 MIA → EWR Jul 26, 17:49 UTCJul 26, 18:22 UTC33m
2026-07-26 UAL488 BUR → SFO Jul 26, 14:15 UTCJul 26, 15:05 UTC50m
2026-07-26 UAL1321 MIA → EWR Jul 26, 01:05 UTCJul 26, 02:00 UTC55m
2026-07-26 UAL1321 MIA → EWR Jul 26, 01:20 UTCJul 26, 01:59 UTC39m
2026-07-25 UAL1846 ORD → CMH Jul 25, 21:55 UTCJul 25, 22:30 UTC35m
2026-07-25 UAL1846 ORD → CMH Jul 25, 17:50 UTCJul 25, 19:55 UTC2h 5m
2026-07-25 UAL1081 EWR → MIA Jul 25, 14:20 UTCJul 25, 16:05 UTC1h 45m
2026-07-24 UAL1282 EWR → RSW Jul 24, 23:45 UTCJul 25, 01:10 UTC1h 25m
2026-07-23 UAL2033 RNO → SFO Jul 23, 19:30 UTCJul 23, 19:50 UTC20m
2026-07-23 UAL2045 TPA → EWR Jul 23, 17:40 UTCJul 23, 17:55 UTC15m
2026-07-23 UAL1235 DEN → DFW Jul 23, 13:15 UTCJul 23, 15:50 UTC2h 35m
2026-07-23 UAL1235 DEN → DFW Jul 23, 13:18 UTCJul 23, 15:50 UTC2h 32m
2026-07-23 UAL1228 CVG → ORD Jul 23, 06:30 UTCJul 23, 08:35 UTC2h 5m
2026-07-23 UAL1268 LGA → IAH Jul 23, 02:35 UTCJul 23, 04:55 UTC2h 20m
2026-07-22 UAL1608 MSN → DEN Jul 22, 19:20 UTCJul 22, 21:25 UTC2h 5m
2026-07-22 UAL1637 MSP → EWR Jul 22, 15:35 UTCJul 22, 17:35 UTC2h 0m
2026-07-21 UAL2470 DEN → MCI Jul 21, 21:55 UTCJul 21, 23:30 UTC1h 35m
2026-07-21 UAL352 IAD → BOS Jul 21, 19:50 UTCJul 21, 20:20 UTC30m
2026-07-21 UAL1772 EWR → MYR Jul 21, 17:53 UTCJul 21, 18:10 UTC17m
2026-07-21 UAL1772 EWR → MYR Jul 21, 17:40 UTCJul 21, 18:05 UTC25m
2026-07-21 UAL472 SFO → RDU Jul 21, 13:45 UTCJul 21, 15:40 UTC1h 55m
2026-07-21 UAL472 SFO → RDU Jul 21, 13:48 UTCJul 21, 15:39 UTC1h 51m
2026-07-20 UAL2130 DEN → PHL Jul 20, 23:45 UTCJul 21, 01:40 UTC1h 55m
2026-07-20 UAL696 RIC → DEN Jul 20, 19:40 UTCJul 20, 21:50 UTC2h 10m
2026-07-20 UAL1836 DEN → MKE Jul 20, 16:15 UTCJul 20, 18:15 UTC2h 0m
2026-07-20 UAL2255 - Jul 20, 13:40 UTCJul 20, 14:00 UTC20m
2026-07-20 UAL2173 - Jul 20, 01:35 UTCJul 20, 01:50 UTC15m
2026-07-20 UAL2173 DEN → HDN Jul 20, 01:35 UTCJul 20, 01:59 UTC24m
2026-07-19 UAL719 SJC → DEN Jul 19, 22:00 UTCJul 20, 00:15 UTC2h 15m
2026-07-19 UAL2808 ORF → IAH Jul 19, 18:52 UTCJul 19, 20:47 UTC1h 55m
2026-07-19 UAL2808 ORF → IAH Jul 19, 18:50 UTCJul 19, 19:00 UTC10m
2026-07-18 UAL4209 - Jul 18, 22:50 UTCJul 18, 23:10 UTC20m
2026-07-18 UAL4209 - Jul 18, 21:55 UTCJul 18, 22:05 UTC10m
2026-07-17 UAL1413 - Jul 17, 14:24 UTCJul 17, 15:10 UTC45m
2026-07-17 UAL1225 ONT → SFO Jul 17, 02:05 UTCJul 17, 03:50 UTC1h 45m
2026-07-16 UAL1604 - Jul 16, 22:40 UTCJul 17, 00:04 UTC1h 25m
2026-07-16 UAL1380 STL → DEN Jul 16, 19:40 UTCJul 16, 21:19 UTC1h 40m
2026-07-16 UAL1380 STL → DEN Jul 16, 19:50 UTCJul 16, 21:23 UTC1h 33m
2026-07-16 UAL652 DEN → STL Jul 16, 15:45 UTCJul 16, 17:25 UTC1h 40m
2026-07-16 UAL1225 - Jul 16, 01:45 UTCJul 16, 03:25 UTC1h 40m
2026-07-15 UAL1604 - Jul 15, 22:35 UTCJul 15, 23:50 UTC1h 15m
2026-07-15 UAL1380 STL → DEN Jul 15, 19:00 UTCJul 15, 20:40 UTC1h 40m
2026-07-15 UAL652 DEN → STL Jul 15, 15:45 UTCJul 15, 17:35 UTC1h 50m
2026-07-15 UAL1602 DFW → DEN Jul 15, 01:03 UTCJul 15, 02:23 UTC1h 20m
2026-07-15 UAL1602 DFW → DEN Jul 15, 00:55 UTCJul 15, 02:25 UTC1h 30m
2026-07-14 UAL1439 - Jul 14, 21:35 UTCJul 14, 22:25 UTC50m
2026-07-14 UAL1072 - Jul 14, 15:25 UTCJul 14, 19:40 UTC4h 15m
2026-07-14 UAL740 - Jul 14, 11:30 UTCJul 14, 13:45 UTC2h 15m
2026-07-14 UAL1027 - Jul 14, 03:55 UTCJul 14, 05:20 UTC1h 25m

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 N804UA page for operator, model, and routing details .

Mode-S AAF27C frequently asked

What is Mode-S code AAF27C?
AAF27C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N804UA.
Where is Mode-S AAF27C registered?
Mode-S code AAF27C 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 AAF27C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAF27C, octal 52571174, decimal 11,203,196.
What flights does AAF27C operate?
Mode-S AAF27C has broadcast 20 distinct callsigns, including UAL2033, UAL2045, UAL1282, UAL298, UAL1871.