Apparatus

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sensors Mode-S transponder

A8D46A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N66808 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A8D46A
Octal
52152152
Decimal
11,064,426
Country
US
Tail
N66808
Type
B739
No current signal · last broadcast 9h ago
Flights observed
208
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A8D46A.

Country allocation

The ICAO 24-bit address A8D46A 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
UAL1575 United Airlines 4 2026-05-22
UAL411 United Airlines 3 2026-06-01
UAL395 United Airlines 3 2026-05-25
UAL1887 United Airlines 3 2026-05-25
UAL1825 United Airlines 3 2026-05-25
UAL1561 United Airlines 3 2026-05-20
UAL593 United Airlines 2 2026-05-17
UAL503 United Airlines 2 2026-05-18
UAL3874 United Airlines 2 2026-04-23
UAL375 United Airlines 2 2026-06-04
UAL320 United Airlines 2 2026-05-09
UAL303 United Airlines 2 2026-06-12
UAL2860 United Airlines 2 2026-05-02
UAL2823 United Airlines 2 2026-06-10
UAL2762 United Airlines 2 2026-05-24
UAL2737 United Airlines 2 2026-06-11
UAL2736 United Airlines 2 2026-06-11
UAL2497 United Airlines 2 2026-05-16
UAL2425 United Airlines 2 2026-04-25
UAL2399 United Airlines 2 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 UAL303 FLL → EWR Jun 12, 23:45 UTCJun 13, 01:10 UTC1h 25m
2026-06-12 UAL2333 ORD → SFO Jun 12, 14:10 UTCJun 12, 21:50 UTC7h 40m
2026-06-11 UAL2737 LCQ → EWR Jun 11, 19:00 UTCJun 11, 21:20 UTC2h 20m
2026-06-11 UAL2737 LCQ → EWR Jun 11, 18:14 UTCJun 11, 21:09 UTC2h 55m
2026-06-11 UAL2736 STI → EWR Jun 11, 13:25 UTCJun 11, 16:15 UTC2h 50m
2026-06-11 UAL2736 STI → EWR Jun 11, 13:10 UTCJun 11, 15:10 UTC2h 0m
2026-06-11 UAL2320 TPA → EWR Jun 11, 02:55 UTCJun 11, 06:50 UTC3h 55m
2026-06-10 UAL2440 ORD → AUS Jun 10, 18:15 UTCJun 10, 21:55 UTC3h 40m
2026-06-10 UAL622 LAX → ORD Jun 10, 15:10 UTCJun 10, 16:00 UTC50m
2026-06-10 UAL2823 IAD → EWR Jun 10, 12:40 UTCJun 10, 13:30 UTC50m
2026-06-10 UAL2823 IAD → EWR Jun 10, 12:53 UTCJun 10, 13:31 UTC38m
2026-06-09 UAL2072 EWR → ATL Jun 9, 22:36 UTCJun 10, 00:49 UTC2h 13m
2026-06-09 UAL2072 EWR → ATL Jun 9, 22:25 UTCJun 10, 01:15 UTC2h 50m
2026-06-09 UAL1955 IAD → PHX Jun 9, 18:30 UTCJun 9, 21:10 UTC2h 40m
2026-06-09 UAL580 BTV → ORD Jun 9, 12:20 UTCJun 9, 15:50 UTC3h 30m
2026-06-08 UAL1275 SFO → RNO Jun 8, 20:10 UTCJun 9, 00:25 UTC4h 15m
2026-06-08 UAL1275 SFO → RNO Jun 8, 20:00 UTCJun 9, 00:21 UTC4h 21m
2026-06-08 UAL1198 LAS → ORD Jun 8, 15:30 UTCJun 8, 18:40 UTC3h 10m
2026-06-08 UAL1733 PDX → SFO Jun 8, 11:25 UTCJun 8, 13:30 UTC2h 5m
2026-06-08 UAL2443 MSN → ORD Jun 8, 02:00 UTCJun 8, 03:45 UTC1h 45m
2026-06-07 UAL1623 EWR → AUS Jun 7, 19:45 UTCJun 7, 21:35 UTC1h 50m
2026-06-07 UAL1623 EWR → AUS Jun 7, 17:30 UTCJun 7, 17:55 UTC25m
2026-06-07 UAL1500 RDU → EWR Jun 7, 14:15 UTCJun 7, 15:55 UTC1h 40m
2026-06-07 UAL2324 GEG → SFO Jun 7, 00:00 UTCJun 7, 01:35 UTC1h 35m
2026-06-06 UAL1126 LAS → EWR Jun 6, 18:45 UTCJun 6, 22:05 UTC3h 20m
2026-06-06 UAL1101 MCO → EWR Jun 6, 14:20 UTCJun 6, 17:10 UTC2h 50m
2026-06-06 UAL773 EWR → MSY Jun 6, 11:00 UTCJun 6, 12:30 UTC1h 30m
2026-06-06 UAL2239 DEN → SFO Jun 6, 03:13 UTCJun 6, 04:43 UTC1h 30m
2026-06-06 UAL2239 DEN → SFO Jun 6, 03:15 UTCJun 6, 04:55 UTC1h 40m
2026-06-05 UAL566 IAH → CVG Jun 5, 23:25 UTCJun 6, 01:25 UTC2h 0m
2026-06-05 UAL662 EWR → DFW Jun 5, 19:45 UTCJun 5, 21:50 UTC2h 5m
2026-06-05 UAL1912 LAX → DEN Jun 5, 16:20 UTCJun 5, 18:15 UTC1h 55m
2026-06-05 UAL1093 LAX → SFO Jun 5, 12:10 UTCJun 5, 14:00 UTC1h 50m
2026-06-05 UAL2334 ORD → PHL Jun 5, 01:55 UTCJun 5, 03:50 UTC1h 55m
2026-06-04 UAL1337 EWR → PDX Jun 4, 22:25 UTCJun 5, 00:45 UTC2h 20m
2026-06-04 UAL414 EWR → SFO Jun 4, 16:35 UTCJun 4, 20:25 UTC3h 50m
2026-06-04 UAL375 BOS → IAH Jun 4, 14:22 UTCJun 4, 14:55 UTC33m
2026-06-04 UAL375 BOS → IAH Jun 4, 14:10 UTCJun 4, 15:00 UTC50m
2026-06-03 UAL733 SFO → SAN Jun 3, 20:05 UTCJun 4, 01:05 UTC5h 0m
2026-06-03 UAL1292 MSN → ORD Jun 3, 14:10 UTCJun 3, 18:10 UTC4h 0m
2026-06-03 UAL581 LAX → SFO Jun 3, 10:30 UTCJun 3, 12:00 UTC1h 30m
2026-06-03 UAL303 FLL → EWR Jun 3, 00:00 UTCJun 3, 01:30 UTC1h 30m
2026-06-02 UAL1691 SFO → IAH Jun 2, 19:40 UTCJun 2, 21:45 UTC2h 5m
2026-06-02 UAL1691 SFO → IAH Jun 2, 19:39 UTCJun 2, 21:24 UTC1h 45m
2026-06-02 UAL1606 SFO → ORD Jun 2, 16:00 UTCJun 2, 18:10 UTC2h 10m
2026-06-02 UAL2315 BOS → ORD Jun 2, 12:00 UTCJun 2, 13:55 UTC1h 55m
2026-06-01 UAL1498 EWR → SFO Jun 1, 19:50 UTCJun 1, 22:25 UTC2h 35m
2026-06-01 UAL1476 DEN → EUG Jun 1, 16:10 UTCJun 1, 18:30 UTC2h 20m
2026-06-01 UAL411 SFO → DEN Jun 1, 12:00 UTCJun 1, 14:10 UTC2h 10m
2026-05-31 UAL2029 ORD → RIC May 31, 23:40 UTCJun 1, 02:10 UTC2h 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 N66808 page for operator, model, and routing details .

Mode-S A8D46A frequently asked

What is Mode-S code A8D46A?
A8D46A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N66808.
Where is Mode-S A8D46A registered?
Mode-S code A8D46A 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 A8D46A broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8D46A, octal 52152152, decimal 11,064,426.
What flights does A8D46A operate?
Mode-S A8D46A has broadcast 20 distinct callsigns, including UAL1575, UAL411, UAL395, UAL1887, UAL1825.