Apparatus

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sensors Mode-S transponder

A7598C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57299 · BOEING 737 MAX 8 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A7598C
Octal
51654614
Decimal
10,967,436
Country
US
Tail
N57299
Type
B38M
No current signal · last broadcast Jul 26, 01:20 UTC
Flights observed
400
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 01:20 UTC

Last known position

Most recent position reported by Mode-S A7598C.

Country allocation

The ICAO 24-bit address A7598C 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
UAL1560 - 10 2026-07-13
UAL1080 - 7 2026-07-13
UAL267 - 6 2026-07-17
UAL231 United Airlines 6 2026-07-25
UAL643 United Airlines 5 2026-07-19
UAL346 - 5 2026-06-29
UAL335 United Airlines 5 2026-05-20
UAL1880 - 5 2026-06-29
UAL2854 - 4 2026-06-14
UAL2663 - 4 2026-07-10
UAL2623 - 4 2026-07-17
UAL2398 United Airlines 4 2026-07-26
UAL230 United Airlines 4 2026-07-25
UAL2252 United Airlines 4 2026-05-15
UAL216 - 4 2026-07-08
UAL2150 United Airlines 4 2026-04-13
UAL1604 United Airlines 4 2026-04-16
UAL1551 - 4 2026-07-03
UAL1384 United Airlines 4 2026-06-18
UAL8186 United Airlines 3 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2398 IAD → EWR Jul 26, 00:23 UTCJul 26, 01:19 UTC56m
2026-07-26 UAL2398 IAD → EWR Jul 26, 00:20 UTCJul 26, 01:20 UTC1h 0m
2026-07-25 UAL231 LAX → LHR Jul 25, 13:50 UTCJul 25, 20:45 UTC6h 55m
2026-07-25 UAL231 LAX → LHR Jul 25, 13:30 UTCJul 25, 20:49 UTC7h 19m
2026-07-25 UAL230 BON → EWR Jul 25, 02:35 UTCJul 25, 08:25 UTC5h 50m
2026-07-24 UAL1784 STT → EWR Jul 24, 17:30 UTCJul 24, 21:45 UTC4h 15m
2026-07-24 UAL1139 EWR → PBI Jul 24, 10:45 UTCJul 24, 15:35 UTC4h 50m
2026-07-23 UAL1446 LIR → EWR Jul 23, 23:05 UTCJul 24, 03:25 UTC4h 20m
2026-07-23 UAL1917 DEN → LIR Jul 23, 16:35 UTCJul 23, 20:40 UTC4h 5m
2026-07-23 UAL1716 PHL → DEN Jul 23, 12:20 UTCJul 23, 14:35 UTC2h 15m
2026-07-23 UAL1300 ATL → ORD Jul 23, 03:47 UTCJul 23, 05:35 UTC1h 48m
2026-07-23 UAL1300 ATL → ORD Jul 23, 03:35 UTCJul 23, 05:40 UTC2h 5m
2026-07-23 UAL1870 IAH → SFO Jul 23, 01:50 UTCJul 23, 02:10 UTC20m
2026-07-23 UAL1870 IAH → SFO Jul 23, 01:24 UTCJul 23, 02:12 UTC48m
2026-07-22 UAL1045 DEN → IAD Jul 22, 19:45 UTCJul 22, 20:00 UTC15m
2026-07-22 UAL1327 ATL → DEN Jul 22, 15:25 UTCJul 22, 18:05 UTC2h 40m
2026-07-22 UAL1307 EWR → BUF Jul 22, 00:35 UTCJul 22, 02:35 UTC2h 0m
2026-07-21 UAL559 EWR → CLE Jul 21, 04:43 UTCJul 21, 09:59 UTC5h 16m
2026-07-21 UAL559 EWR → CLE Jul 21, 04:40 UTCJul 21, 05:00 UTC20m
2026-07-20 UAL205 AUS → EWR Jul 20, 19:55 UTCJul 21, 00:25 UTC4h 30m
2026-07-20 UAL1004 LAX → ITO Jul 20, 05:05 UTCJul 20, 16:45 UTC11h 40m
2026-07-19 UAL643 KOA → SFO Jul 19, 22:15 UTCJul 20, 01:10 UTC2h 55m
2026-07-19 UAL2780 IAD → EWR Jul 19, 17:50 UTCJul 19, 20:40 UTC2h 50m
2026-07-19 UAL2748 - Jul 19, 12:10 UTCJul 19, 16:05 UTC3h 55m
2026-07-18 UAL2279 - Jul 18, 23:55 UTCJul 19, 01:20 UTC1h 25m
2026-07-18 UAL1958 RDU → EWR Jul 18, 21:00 UTCJul 18, 21:45 UTC45m
2026-07-17 UAL2623 SFO → OGG Jul 17, 21:29 UTCJul 18, 02:24 UTC4h 55m
2026-07-17 UAL2623 - Jul 17, 21:30 UTCJul 17, 22:10 UTC40m
2026-07-17 UAL267 - Jul 17, 14:00 UTCJul 17, 19:09 UTC5h 10m
2026-07-17 UAL8154 YUL → EWR Jul 17, 07:40 UTCJul 17, 12:35 UTC4h 55m
2026-07-17 UAL8154 YUL → EWR Jul 17, 07:22 UTCJul 17, 12:33 UTC5h 11m
2026-07-17 UAL2482 STL → SFO Jul 17, 02:15 UTCJul 17, 06:05 UTC3h 50m
2026-07-16 UAL2090 - Jul 16, 20:00 UTCJul 16, 23:29 UTC3h 30m
2026-07-16 UAL1257 - Jul 16, 12:09 UTCJul 16, 17:30 UTC5h 20m
2026-07-16 UAL2180 - Jul 16, 00:10 UTCJul 16, 02:40 UTC2h 30m
2026-07-15 UAL2426 - Jul 15, 18:00 UTCJul 15, 22:10 UTC4h 10m
2026-07-15 UAL2426 SNA → ORD Jul 15, 17:50 UTCJul 15, 21:36 UTC3h 46m
2026-07-15 UAL2423 - Jul 15, 10:50 UTCJul 15, 15:35 UTC4h 45m
2026-07-14 UAL1187 - Jul 14, 23:40 UTCJul 15, 02:00 UTC2h 20m
2026-07-14 UAL2659 - Jul 14, 20:05 UTCJul 14, 22:15 UTC2h 10m
2026-07-14 UAL1307 BOS → EWR Jul 14, 13:40 UTCJul 14, 14:30 UTC50m
2026-07-14 UAL593 EWR → BOS Jul 14, 11:19 UTCJul 14, 12:06 UTC47m
2026-07-14 UAL593 - Jul 14, 11:20 UTCJul 14, 12:10 UTC50m
2026-07-13 UAL1560 SJO → EWR Jul 13, 19:02 UTCJul 13, 23:41 UTC4h 39m
2026-07-13 UAL1560 - Jul 13, 19:00 UTCJul 13, 19:15 UTC15m
2026-07-13 UAL1080 EWR → SJO Jul 13, 16:11 UTCJul 13, 17:23 UTC1h 12m
2026-07-13 UAL1080 - Jul 13, 12:40 UTCJul 13, 15:55 UTC3h 15m
2026-07-13 UAL1518 - Jul 13, 01:20 UTCJul 13, 02:25 UTC1h 5m
2026-07-12 UAL1518 PUJ → EWR Jul 12, 23:02 UTCJul 13, 02:27 UTC3h 25m
2026-07-12 UAL1699 DEN → PUJ Jul 12, 16:11 UTCJul 12, 21:26 UTC5h 15m

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 N57299 page for operator, model, and routing details .

Mode-S A7598C frequently asked

What is Mode-S code A7598C?
A7598C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57299.
Where is Mode-S A7598C registered?
Mode-S code A7598C 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 A7598C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 01:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7598C, octal 51654614, decimal 10,967,436.
What flights does A7598C operate?
Mode-S A7598C has broadcast 20 distinct callsigns, including UAL1560, UAL1080, UAL267, UAL231, UAL643.