Apparatus

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sensors Mode-S transponder

AADB37

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N799UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AADB37
Octal
52555467
Decimal
11,197,239
Country
US
Tail
N799UA
Type
B772
No current signal · last broadcast 1h ago
Flights observed
199
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AADB37.

Country allocation

The ICAO 24-bit address AADB37 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
UAL160 - 9 2026-07-12
UAL984 United Airlines 8 2026-05-09
UAL924 - 7 2026-06-25
UAL889 United Airlines 7 2026-06-07
UAL149 - 7 2026-06-21
UAL130 - 7 2026-06-19
UAL949 - 6 2026-06-25
UAL927 United Airlines 6 2026-06-12
UAL926 - 6 2026-07-10
UAL925 - 6 2026-07-13
UAL888 United Airlines 6 2026-06-06
UAL852 United Airlines 6 2026-06-10
UAL4 - 6 2026-06-16
UAL194 - 6 2026-07-11
UAL1777 - 6 2026-06-22
UAL148 - 6 2026-06-22
UAL45 United Airlines 5 2026-06-11
UAL57 United Airlines 4 2026-05-08
UAL5 - 4 2026-07-13
UAL44 United Airlines 4 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL942 - Jul 14, 03:10 UTCJul 14, 03:45 UTC35m
2026-07-13 UAL925 - Jul 13, 16:50 UTCJul 14, 00:00 UTC7h 10m
2026-07-13 UAL5 - Jul 13, 01:25 UTCJul 13, 10:25 UTC9h 0m
2026-07-12 UAL160 - Jul 12, 10:50 UTCJul 12, 21:30 UTC10h 40m
2026-07-11 UAL194 SFO → MUC Jul 11, 22:01 UTCJul 12, 08:10 UTC10h 10m
2026-07-11 UAL3029 FRA → SFO Jul 11, 07:51 UTCJul 11, 19:04 UTC11h 13m
2026-07-11 UAL3029 - Jul 11, 07:45 UTCJul 11, 10:55 UTC3h 10m
2026-07-10 UAL926 SFO → FRA Jul 10, 08:45 UTCJul 10, 18:50 UTC10h 5m
2026-07-04 UAL2328 - Jul 4, 19:55 UTCJul 5, 01:00 UTC5h 5m
2026-07-04 UAL31 - Jul 4, 08:15 UTCJul 4, 16:45 UTC8h 30m
2026-07-04 UAL31 MUC → EWR Jul 4, 08:07 UTCJul 4, 16:45 UTC8h 38m
2026-07-03 UAL30 - Jul 3, 22:25 UTCJul 4, 03:45 UTC5h 20m
2026-07-03 UAL30 EWR → MUC Jul 3, 21:58 UTCJul 4, 05:30 UTC7h 32m
2026-07-03 UAL71 - Jul 3, 07:30 UTCJul 3, 07:45 UTC15m
2026-07-03 UAL71 AMS → EWR Jul 3, 07:31 UTCJul 3, 15:18 UTC7h 47m
2026-07-02 UAL70 EWR → AMS Jul 2, 23:00 UTCJul 3, 00:30 UTC1h 30m
2026-07-02 UAL70 EWR → AMS Jul 2, 22:28 UTCJul 3, 05:29 UTC7h 1m
2026-07-02 UAL56 CDG → EWR Jul 2, 08:05 UTCJul 2, 15:35 UTC7h 30m
2026-07-02 UAL56 CDG → EWR Jul 2, 08:09 UTCJul 2, 15:30 UTC7h 21m
2026-07-01 UAL915 IAD → CDG Jul 1, 22:50 UTCJul 2, 05:40 UTC6h 50m
2026-07-01 UAL914 CDG → IAD Jul 1, 11:55 UTCJul 1, 19:50 UTC7h 55m
2026-06-30 UAL990 SFO → CDG Jun 30, 23:05 UTCJul 1, 09:05 UTC10h 0m
2026-06-28 UAL673 - Jun 28, 15:49 UTCJun 29, 02:54 UTC11h 5m
2026-06-28 UAL672 SFO → BCN Jun 28, 01:34 UTCJun 28, 12:19 UTC10h 45m
2026-06-27 UAL1336 - Jun 27, 13:55 UTCJun 27, 19:15 UTC5h 20m
2026-06-26 UAL366 SFO → EWR Jun 26, 21:20 UTCJun 27, 02:04 UTC4h 45m
2026-06-25 UAL949 - Jun 25, 12:25 UTCJun 25, 22:34 UTC10h 10m
2026-06-25 UAL924 IAD → LHR Jun 25, 02:39 UTCJun 25, 09:29 UTC6h 50m
2026-06-25 UAL924 IAD → LHR Jun 25, 02:33 UTCJun 25, 09:22 UTC6h 49m
2026-06-24 UAL925 - Jun 24, 16:09 UTCJun 24, 23:50 UTC7h 40m
2026-06-24 UAL948 SFO → LHR Jun 24, 00:25 UTCJun 24, 10:19 UTC9h 55m
2026-06-22 UAL1777 EWR → SFO Jun 22, 12:40 UTCJun 22, 18:00 UTC5h 20m
2026-06-22 UAL148 - Jun 22, 00:24 UTCJun 22, 09:14 UTC8h 50m
2026-06-22 UAL148 GRU → EWR Jun 22, 00:26 UTCJun 22, 09:13 UTC8h 47m
2026-06-21 UAL149 EWR → GRU Jun 21, 01:01 UTCJun 21, 09:43 UTC8h 42m
2026-06-21 UAL149 - Jun 21, 00:55 UTCJun 21, 09:44 UTC8h 50m
2026-06-20 UAL55 - Jun 20, 11:25 UTCJun 20, 18:49 UTC7h 25m
2026-06-20 UAL54 EWR → CDG Jun 20, 02:04 UTCJun 20, 08:10 UTC6h 6m
2026-06-20 UAL54 - Jun 20, 02:00 UTCJun 20, 03:29 UTC1h 30m
2026-06-19 UAL130 HND → EWR Jun 19, 10:29 UTCJun 19, 22:55 UTC12h 25m
2026-06-18 UAL803 IAD → HND Jun 18, 19:00 UTCJun 19, 02:04 UTC7h 4m
2026-06-18 UAL803 IAD → HND Jun 18, 18:50 UTCJun 19, 08:23 UTC13h 33m
2026-06-17 UAL933 FRA → IAD Jun 17, 16:05 UTCJun 18, 00:00 UTC7h 55m
2026-06-17 UAL46 - Jun 17, 02:05 UTCJun 17, 05:45 UTC3h 40m
2026-06-17 UAL46 IAH → FRA Jun 17, 02:13 UTCJun 17, 10:52 UTC8h 39m
2026-06-16 UAL4 - Jun 16, 13:50 UTCJun 16, 23:10 UTC9h 21m
2026-06-16 UAL4 LHR → IAH Jun 16, 13:50 UTCJun 16, 23:04 UTC9h 14m
2026-06-16 UAL5 - Jun 16, 02:34 UTCJun 16, 10:55 UTC8h 20m
2026-06-15 UAL4 LHR → IAH Jun 15, 13:15 UTCJun 15, 22:49 UTC9h 35m
2026-06-15 UAL4 LHR → IAH Jun 15, 13:05 UTCJun 15, 22:54 UTC9h 49m

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 N799UA page for operator, model, and routing details .

Mode-S AADB37 frequently asked

What is Mode-S code AADB37?
AADB37 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N799UA.
Where is Mode-S AADB37 registered?
Mode-S code AADB37 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 AADB37 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AADB37, octal 52555467, decimal 11,197,239.
What flights does AADB37 operate?
Mode-S AADB37 has broadcast 20 distinct callsigns, including UAL160, UAL984, UAL924, UAL889, UAL149.