Apparatus

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sensors Mode-S transponder

A8D489

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N66814 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A8D489
Octal
52152211
Decimal
11,064,457
Country
US
Tail
N66814
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
460
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A8D489.

Country allocation

The ICAO 24-bit address A8D489 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
UAL1214 - 5 2026-06-20
UAL721 - 4 2026-07-04
UAL567 - 4 2026-07-19
UAL414 - 4 2026-07-01
UAL2677 United Airlines 4 2026-04-29
UAL2311 - 4 2026-07-13
UAL490 - 3 2026-07-10
UAL468 - 3 2026-07-06
UAL375 United Airlines 3 2026-06-10
UAL2610 United Airlines 3 2026-05-19
UAL2497 United Airlines 3 2026-05-15
UAL2394 United Airlines 3 2026-05-28
UAL2336 - 3 2026-07-17
UAL2138 United Airlines 3 2026-07-26
UAL2131 - 3 2026-07-08
UAL1895 - 3 2026-07-06
UAL1782 - 3 2026-07-12
UAL1297 United Airlines 3 2026-07-26
UAL1261 United Airlines 3 2026-07-25
UAL1248 - 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1334 EWR → PBI Jul 26, 20:45 UTCJul 26, 22:15 UTC1h 30m
2026-07-26 UAL2138 ORD → EWR Jul 26, 18:10 UTCJul 26, 18:35 UTC25m
2026-07-26 UAL2138 ORD → EWR Jul 26, 18:13 UTCJul 26, 18:34 UTC21m
2026-07-26 UAL1297 LAS → EWR Jul 26, 16:10 UTCJul 26, 16:40 UTC30m
2026-07-26 UAL656 ORD → BOS Jul 26, 13:10 UTCJul 26, 14:20 UTC1h 10m
2026-07-26 UAL1923 IAH → LGA Jul 26, 03:00 UTCJul 26, 03:35 UTC35m
2026-07-25 UAL254 ORD → BOS Jul 25, 23:00 UTCJul 26, 00:55 UTC1h 55m
2026-07-25 UAL546 DEN → TUS Jul 25, 19:15 UTCJul 25, 20:55 UTC1h 40m
2026-07-25 UAL570 BOS → EWR Jul 25, 16:00 UTCJul 25, 17:40 UTC1h 40m
2026-07-25 UAL570 BOS → EWR Jul 25, 15:57 UTCJul 25, 17:40 UTC1h 43m
2026-07-25 UAL371 - Jul 25, 12:10 UTCJul 25, 14:05 UTC1h 55m
2026-07-25 UAL1261 EWR → IAH Jul 25, 02:00 UTCJul 25, 03:45 UTC1h 45m
2026-07-24 UAL1395 IAD → BDL Jul 24, 21:30 UTCJul 25, 00:05 UTC2h 35m
2026-07-24 UAL1797 RDU → EWR Jul 24, 17:30 UTCJul 24, 19:45 UTC2h 15m
2026-07-24 UAL1227 PHX → IAD Jul 24, 13:20 UTCJul 24, 15:30 UTC2h 10m
2026-07-22 UAL1900 COS → DEN Jul 22, 21:10 UTCJul 22, 23:25 UTC2h 15m
2026-07-22 UAL1205 - Jul 22, 14:05 UTCJul 22, 15:15 UTC1h 10m
2026-07-22 UAL1205 RDU → EWR Jul 22, 13:58 UTCJul 22, 15:13 UTC1h 15m
2026-07-21 UAL2091 ORD → RDU Jul 21, 19:40 UTCJul 21, 21:30 UTC1h 50m
2026-07-21 UAL2370 SMF → ORD Jul 21, 14:10 UTCJul 21, 17:45 UTC3h 35m
2026-07-21 UAL1920 - Jul 21, 01:00 UTCJul 21, 04:55 UTC3h 55m
2026-07-20 UAL2784 PHL → ORD Jul 20, 17:55 UTCJul 20, 19:40 UTC1h 45m
2026-07-20 UAL2784 PHL → ORD Jul 20, 17:45 UTCJul 20, 19:18 UTC1h 33m
2026-07-20 UAL2752 - Jul 20, 14:40 UTCJul 20, 16:15 UTC1h 35m
2026-07-20 UAL307 MSP → ORD Jul 20, 11:25 UTCJul 20, 12:50 UTC1h 25m
2026-07-20 UAL1131 - Jul 20, 02:55 UTCJul 20, 03:55 UTC1h 0m
2026-07-19 UAL2135 - Jul 19, 22:40 UTCJul 20, 01:00 UTC2h 20m
2026-07-19 UAL1448 - Jul 19, 18:00 UTCJul 19, 20:00 UTC2h 0m
2026-07-19 UAL567 - Jul 19, 14:05 UTCJul 19, 14:25 UTC20m
2026-07-19 UAL567 - Jul 19, 13:05 UTCJul 19, 14:15 UTC1h 10m
2026-07-19 UAL567 MSP → ORD Jul 19, 12:52 UTCJul 19, 13:47 UTC55m
2026-07-19 UAL1131 - Jul 19, 03:20 UTCJul 19, 04:20 UTC1h 0m
2026-07-18 UAL1382 PHX → EWR Jul 18, 19:45 UTCJul 18, 20:31 UTC46m
2026-07-18 UAL1382 PHX → EWR Jul 18, 19:35 UTCJul 18, 20:45 UTC1h 10m
2026-07-18 UAL1355 ORD → STL Jul 18, 16:15 UTCJul 18, 17:00 UTC45m
2026-07-18 UAL752 - Jul 18, 11:15 UTCJul 18, 13:50 UTC2h 35m
2026-07-18 UAL2294 ORD → FLL Jul 18, 00:15 UTCJul 18, 02:55 UTC2h 41m
2026-07-17 UAL1710 - Jul 17, 18:19 UTCJul 17, 22:00 UTC3h 40m
2026-07-17 UAL2428 ORD → SAN Jul 17, 12:30 UTCJul 17, 16:00 UTC3h 30m
2026-07-17 UAL2336 - Jul 17, 01:29 UTCJul 17, 01:39 UTC10m
2026-07-16 UAL2336 - Jul 16, 21:50 UTCJul 17, 01:39 UTC3h 50m
2026-07-16 UAL2336 PDX → ORD Jul 16, 21:35 UTCJul 17, 01:13 UTC3h 38m
2026-07-16 UAL644 DEN → PDX Jul 16, 17:45 UTCJul 16, 19:50 UTC2h 5m
2026-07-16 UAL2360 - Jul 16, 14:00 UTCJul 16, 15:55 UTC1h 55m
2026-07-16 UAL1894 - Jul 16, 00:35 UTCJul 16, 02:15 UTC1h 40m
2026-07-15 UAL1412 MFR → DEN Jul 15, 20:40 UTCJul 15, 22:45 UTC2h 5m
2026-07-15 UAL2322 SFO → MFR Jul 15, 18:25 UTCJul 15, 19:10 UTC45m
2026-07-15 UAL2209 - Jul 15, 15:10 UTCJul 15, 16:45 UTC1h 35m
2026-07-15 UAL2347 SFO → PHX Jul 15, 03:00 UTCJul 15, 04:40 UTC1h 40m
2026-07-14 UAL1334 - Jul 14, 21:35 UTCJul 15, 01:30 UTC3h 54m

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 N66814 page for operator, model, and routing details .

Mode-S A8D489 frequently asked

What is Mode-S code A8D489?
A8D489 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N66814.
Where is Mode-S A8D489 registered?
Mode-S code A8D489 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 A8D489 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8D489, octal 52152211, decimal 11,064,457.
What flights does A8D489 operate?
Mode-S A8D489 has broadcast 20 distinct callsigns, including UAL1214, UAL721, UAL567, UAL414, UAL2677.