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
Broadcasting now · callsign UAL803 · 34,000 ft
Flights observed
111
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AADB37 is currently broadcasting. Map zoomed to live position.

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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UAL803 IAD → HND May 29, 17:25 UTCMay 29, 23:45 UTC6h 20m
2026-05-28 UAL925 LHR → IAD May 28, 16:40 UTCMay 28, 23:50 UTC7h 10m
2026-05-28 UAL5 IAH → LHR May 28, 02:15 UTCMay 28, 11:30 UTC9h 15m
2026-05-27 UAL47 FRA → IAH May 27, 13:15 UTCMay 27, 23:25 UTC10h 10m
2026-05-27 UAL46 IAH → FRA May 27, 00:25 UTCMay 27, 09:25 UTC9h 1m
2026-05-26 UAL160 MUC → IAH May 26, 10:34 UTCMay 26, 19:45 UTC9h 10m
2026-05-26 UAL160 MUC → IAH May 26, 10:39 UTCMay 26, 21:09 UTC10h 30m
2026-05-25 UAL194 SFO → MUC May 25, 21:30 UTCMay 26, 07:55 UTC10h 25m
2026-05-24 UAL889 PEK → SFO May 24, 11:55 UTCMay 24, 13:45 UTC1h 50m
2026-05-24 UAL889 PEK → SFO May 24, 04:05 UTCMay 24, 21:50 UTC17h 45m
2026-05-23 UAL888 SFO → PEK May 23, 22:00 UTCMay 24, 21:45 UTC23h 45m
2026-05-23 UAL888 SFO → PEK May 23, 18:15 UTCMay 24, 07:36 UTC13h 21m
2026-05-23 UAL888 SFO → PEK May 23, 18:15 UTCMay 23, 23:40 UTC5h 25m
2026-05-22 UAL1777 EWR → IAH May 22, 12:57 UTCMay 22, 18:38 UTC5h 41m
2026-05-22 UAL1777 EWR → IAH May 22, 13:10 UTCMay 22, 18:50 UTC5h 40m
2026-05-22 UAL8141 SAN → EWR May 22, 05:55 UTCMay 22, 10:25 UTC4h 30m
2026-05-21 UAL927 FRA → SFO May 21, 16:01 UTCMay 21, 19:00 UTC3h 0m
2026-05-21 UAL927 FRA → SFO May 21, 15:51 UTCMay 22, 02:44 UTC10h 53m
2026-05-21 UAL926 SFO → FRA May 21, 02:40 UTCMay 21, 13:10 UTC10h 30m
2026-05-20 UAL45 ZRH → SFO May 20, 12:07 UTCMay 20, 22:51 UTC10h 44m
2026-05-20 UAL45 ZRH → SFO May 20, 12:05 UTCMay 20, 22:55 UTC10h 50m
2026-05-19 UAL44 SFO → ZRH May 19, 20:55 UTCMay 20, 07:25 UTC10h 31m
2026-05-19 UAL852 TPE → SAN May 19, 08:05 UTCMay 19, 17:40 UTC9h 35m
2026-05-19 UAL852 TPE → SAN May 19, 06:35 UTCMay 19, 06:50 UTC15m
2026-05-18 UAL853 SFO → TPE May 18, 07:00 UTCMay 18, 20:00 UTC12h 59m
2026-05-17 UAL889 PEK → SFO May 17, 10:40 UTCMay 17, 20:35 UTC9h 55m
2026-05-17 UAL889 PEK → SFO May 17, 09:45 UTCMay 17, 09:55 UTC10m
2026-05-16 UAL888 SFO → PEK May 16, 17:45 UTCMay 17, 05:50 UTC12h 5m
2026-05-15 UAL939 LHR → SFO May 15, 15:25 UTCMay 16, 01:50 UTC10h 25m
2026-05-15 UAL930 SFO → LHR May 15, 03:05 UTCMay 15, 12:55 UTC9h 50m
2026-05-14 UAL45 ZRH → SFO May 14, 12:05 UTCMay 14, 23:30 UTC11h 25m
2026-05-13 UAL44 SFO → ZRH May 13, 20:52 UTCMay 14, 07:20 UTC10h 28m
2026-05-13 UAL44 SFO → ZRH May 13, 20:55 UTCMay 13, 23:35 UTC2h 40m
2026-05-13 UAL852 TPE → SAN May 13, 07:25 UTCMay 13, 17:55 UTC10h 30m
2026-05-13 UAL852 TPE → SAN May 13, 06:45 UTCMay 13, 06:55 UTC10m
2026-05-12 UAL853 SFO → TPE May 12, 07:10 UTCMay 12, 19:45 UTC12h 35m
2026-05-11 UAL673 SFO → BOS May 11, 14:30 UTCMay 11, 22:35 UTC8h 5m
2026-05-11 UAL672 EWR → ATL May 11, 01:25 UTCMay 11, 12:15 UTC10h 50m
2026-05-10 UAL59 FRA → SFO May 10, 11:10 UTCMay 10, 22:09 UTC11h 0m
2026-05-09 UAL58 SFO → FRA May 9, 21:07 UTCMay 10, 07:05 UTC9h 58m
2026-05-09 UAL58 SFO → FRA May 9, 20:55 UTCMay 10, 07:15 UTC10h 20m
2026-05-09 UAL984 CDG → SFO May 9, 07:25 UTCMay 9, 18:05 UTC10h 40m
2026-05-09 UAL984 CDG → SFO May 9, 07:39 UTCMay 9, 17:49 UTC10h 10m
2026-05-08 UAL57 EWR → CDG May 8, 21:45 UTCMay 9, 04:35 UTC6h 50m
2026-05-08 UAL148 GRU → EWR May 8, 00:20 UTCMay 8, 09:19 UTC9h 0m
2026-05-07 UAL149 EWR → GRU May 7, 01:16 UTCMay 7, 09:48 UTC8h 32m
2026-05-07 UAL149 EWR → GRU May 7, 00:55 UTCMay 7, 10:00 UTC9h 5m
2026-05-06 UAL435 KOA → SFO May 6, 16:15 UTCMay 6, 21:20 UTC5h 5m
2026-05-02 UAL939 LHR → SFO May 2, 15:40 UTCMay 3, 02:20 UTC10h 40m
2026-05-02 UAL930 SFO → LHR May 2, 02:55 UTCMay 2, 12:45 UTC9h 50m

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?
Yes. Mode-S AADB37 is currently airborne.
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 UAL984, UAL160, UAL949, UAL194, UAL925.