Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0A8DF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14107 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A0A8DF
Octal
50124337
Decimal
10,528,991
Country
US
Tail
N14107
Type
B752
No current signal · last broadcast 12d ago
Flights observed
225
Distinct callsigns
20
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A0A8DF.

Country allocation

The ICAO 24-bit address A0A8DF 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
UAL887 United Airlines 9 2026-05-19
UAL1343 United Airlines 9 2026-05-01
UAL978 United Airlines 8 2026-06-10
UAL2626 United Airlines 8 2026-05-01
UAL979 United Airlines 7 2026-06-10
UAL886 United Airlines 6 2026-05-18
UAL698 - 6 2026-06-15
UAL37 - 5 2026-06-22
UAL229 United Airlines 5 2026-06-08
UAL2248 - 5 2026-06-16
UAL145 - 5 2026-06-18
UAL648 United Airlines 4 2026-06-16
UAL351 United Airlines 4 2026-05-28
UAL271 United Airlines 4 2026-06-24
UAL270 - 4 2026-06-24
UAL2445 - 4 2026-06-17
UAL228 United Airlines 4 2026-06-08
UAL2115 United Airlines 4 2026-05-21
UAL144 - 4 2026-06-18
UAL1340 United Airlines 4 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-01 UAL3914 CDG → SFO Jul 1, 16:07 UTCJul 1, 18:53 UTC2h 46m
2026-07-01 UAL3914 CDG → SFO Jul 1, 16:05 UTCJul 1, 18:55 UTC2h 50m
2026-06-30 UAL2301 ORD → EWR Jun 30, 13:50 UTCJun 30, 15:25 UTC1h 35m
2026-06-29 UAL2053 - Jun 29, 17:24 UTCJun 29, 19:15 UTC1h 50m
2026-06-28 UAL1149 EWR → SRQ Jun 28, 14:34 UTCJun 28, 19:29 UTC4h 55m
2026-06-28 UAL1558 - Jun 28, 00:55 UTCJun 28, 06:24 UTC5h 30m
2026-06-27 UAL274 SFO → EWR Jun 27, 18:45 UTCJun 27, 23:19 UTC4h 35m
2026-06-27 UAL1095 IAD → SFO Jun 27, 10:50 UTCJun 27, 16:24 UTC5h 35m
2026-06-26 UAL399 KEF → IAD Jun 26, 11:49 UTCJun 26, 17:25 UTC5h 36m
2026-06-26 UAL399 KEF → IAD Jun 26, 11:34 UTCJun 26, 17:29 UTC5h 55m
2026-06-26 UAL398 IAD → KEF Jun 26, 03:29 UTCJun 26, 08:40 UTC5h 10m
2026-06-26 UAL398 IAD → KEF Jun 26, 03:20 UTCJun 26, 08:36 UTC5h 16m
2026-06-25 UAL399 - Jun 25, 11:39 UTCJun 25, 17:34 UTC5h 55m
2026-06-25 UAL912 - Jun 25, 04:20 UTCJun 25, 09:45 UTC5h 25m
2026-06-25 UAL912 ORD → KEF Jun 25, 03:08 UTCJun 25, 09:44 UTC6h 36m
2026-06-24 UAL661 ORD → EWR Jun 24, 21:12 UTCJun 24, 23:02 UTC1h 50m
2026-06-24 UAL661 ORD → EWR Jun 24, 21:09 UTCJun 24, 23:04 UTC1h 55m
2026-06-24 UAL271 ATL → EWR Jun 24, 11:34 UTCJun 24, 18:34 UTC7h 0m
2026-06-24 UAL270 - Jun 24, 03:15 UTCJun 24, 08:39 UTC5h 25m
2026-06-23 UAL2227 - Jun 23, 19:19 UTCJun 23, 23:55 UTC4h 35m
2026-06-22 UAL2191 - Jun 22, 18:54 UTCJun 23, 00:24 UTC5h 30m
2026-06-22 UAL37 - Jun 22, 08:50 UTCJun 22, 16:10 UTC7h 20m
2026-06-22 UAL36 EWR → EDI Jun 22, 01:10 UTCJun 22, 07:04 UTC5h 55m
2026-06-21 UAL1283 EWR → ATL Jun 21, 19:00 UTCJun 21, 22:04 UTC3h 5m
2026-06-19 UAL2756 SFO → ORD Jun 19, 20:04 UTCJun 19, 23:59 UTC3h 55m
2026-06-19 UAL1403 LAX → EWR Jun 19, 13:20 UTCJun 19, 17:55 UTC4h 35m
2026-06-18 UAL2641 SFO → SAN Jun 18, 22:20 UTCJun 19, 03:39 UTC5h 19m
2026-06-18 UAL145 OPO → EWR Jun 18, 11:50 UTCJun 18, 19:25 UTC7h 35m
2026-06-18 UAL144 - Jun 18, 02:25 UTCJun 18, 08:25 UTC6h 0m
2026-06-17 UAL1970 - Jun 17, 18:25 UTCJun 17, 23:40 UTC5h 15m
2026-06-17 UAL1970 LAX → EWR Jun 17, 18:35 UTCJun 17, 23:36 UTC5h 1m
2026-06-17 UAL2445 - Jun 17, 11:10 UTCJun 17, 16:35 UTC5h 25m
2026-06-16 UAL2248 SFO → EWR Jun 16, 22:40 UTCJun 17, 03:30 UTC4h 50m
2026-06-16 UAL648 EWR → SFO Jun 16, 15:24 UTCJun 16, 20:55 UTC5h 31m
2026-06-15 UAL2248 - Jun 15, 22:59 UTCJun 16, 03:50 UTC4h 50m
2026-06-15 UAL648 EWR → SFO Jun 15, 15:55 UTCJun 15, 21:35 UTC5h 40m
2026-06-15 UAL698 - Jun 15, 05:20 UTCJun 15, 09:49 UTC4h 30m
2026-06-14 UAL2080 - Jun 14, 21:05 UTCJun 15, 03:30 UTC6h 24m
2026-06-14 UAL271 ATL → EWR Jun 14, 11:35 UTCJun 14, 18:10 UTC6h 35m
2026-06-14 UAL270 EUG → SFO Jun 14, 03:00 UTCJun 14, 08:40 UTC5h 40m
2026-06-13 UAL2812 ORD → EWR Jun 13, 22:00 UTCJun 13, 23:35 UTC1h 35m
2026-06-13 UAL289 EWR → RDU Jun 13, 08:45 UTCJun 13, 16:30 UTC7h 45m
2026-06-13 UAL288 DCA → ORD Jun 13, 00:40 UTCJun 13, 07:10 UTC6h 29m
2026-06-12 UAL3936 DEN → SFO Jun 12, 13:55 UTCJun 12, 21:45 UTC7h 50m
2026-06-12 UAL3936 DEN → SFO Jun 12, 13:17 UTCJun 12, 21:22 UTC8h 5m
2026-06-12 UAL118 ORD → EDI Jun 12, 02:45 UTCJun 12, 09:40 UTC6h 55m
2026-06-11 UAL913 HNL → SFO Jun 11, 20:40 UTCJun 11, 21:30 UTC50m
2026-06-11 UAL913 HNL → SFO Jun 11, 19:26 UTCJun 11, 21:11 UTC1h 45m
2026-06-11 UAL913 HNL → SFO Jun 11, 12:10 UTCJun 11, 18:20 UTC6h 10m
2026-06-11 UAL398 EWR → TPA Jun 11, 03:45 UTCJun 11, 09:10 UTC5h 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 N14107 page for operator, model, and routing details .

Mode-S A0A8DF frequently asked

What is Mode-S code A0A8DF?
A0A8DF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14107.
Where is Mode-S A0A8DF registered?
Mode-S code A0A8DF 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 A0A8DF broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A8DF, octal 50124337, decimal 10,528,991.
What flights does A0A8DF operate?
Mode-S A0A8DF has broadcast 20 distinct callsigns, including UAL887, UAL1343, UAL978, UAL2626, UAL979.