Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A98539

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N712TW · BOEING 757-200 · operated by DELTA AIR LINES INC

Hex
A98539
Octal
52302471
Decimal
11,109,689
Country
US
Tail
N712TW
Type
B752
No current signal · last broadcast 5h ago
Flights observed
297
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A98539.

Country allocation

The ICAO 24-bit address A98539 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
DAL667 - 17 2026-07-12
DAL383 - 16 2026-07-12
DAL791 - 15 2026-07-10
DAL363 - 14 2026-07-13
DAL329 - 13 2026-06-12
DAL2112 - 13 2026-07-13
DAL2012 - 10 2026-07-03
DAL823 Delta Air Lines 9 2026-05-01
DAL392 Delta Air Lines 9 2026-06-09
DAL987 - 8 2026-06-17
DAL2286 Delta Air Lines 8 2026-05-06
DAL1732 - 8 2026-07-11
DAL923 Delta Air Lines 7 2026-04-30
DAL570 Delta Air Lines 7 2026-05-01
DAL507 Delta Air Lines 7 2026-06-10
DAL556 - 6 2026-07-04
DAL437 Delta Air Lines 6 2026-06-08
DAL1857 - 6 2026-07-01
DAL1488 Delta Air Lines 6 2026-04-30
DAL695 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL724 - Jul 14, 00:05 UTCJul 14, 04:20 UTC4h 15m
2026-07-13 DAL363 - Jul 13, 16:25 UTCJul 13, 21:30 UTC5h 5m
2026-07-13 DAL2112 - Jul 13, 12:00 UTCJul 13, 12:30 UTC30m
2026-07-13 DAL2112 - Jul 13, 07:15 UTCJul 13, 11:55 UTC4h 40m
2026-07-12 DAL667 JFK → SFO Jul 12, 23:40 UTCJul 13, 05:01 UTC5h 20m
2026-07-12 DAL383 - Jul 12, 16:15 UTCJul 12, 21:25 UTC5h 10m
2026-07-12 DAL383 SFO → JFK Jul 12, 16:13 UTCJul 12, 21:21 UTC5h 8m
2026-07-12 DAL667 JFK → SFO Jul 12, 04:35 UTCJul 12, 09:50 UTC5h 15m
2026-07-12 DAL667 JFK → SFO Jul 12, 04:36 UTCJul 12, 09:46 UTC5h 10m
2026-07-11 DAL383 OAK → JFK Jul 11, 16:25 UTCJul 11, 21:30 UTC5h 5m
2026-07-11 DAL1732 JFK → SFO Jul 11, 01:45 UTCJul 11, 07:50 UTC6h 5m
2026-07-10 DAL791 PHX → JFK Jul 10, 19:25 UTCJul 10, 23:40 UTC4h 15m
2026-07-10 DAL791 JFK → PHX Jul 10, 12:25 UTCJul 10, 17:20 UTC4h 55m
2026-07-10 DAL396 - Jul 10, 00:40 UTCJul 10, 05:45 UTC5h 5m
2026-07-09 DAL750 ATL → SFO Jul 9, 17:30 UTCJul 9, 22:00 UTC4h 30m
2026-07-09 DAL2326 JAX → ATL Jul 9, 14:45 UTCJul 9, 15:30 UTC45m
2026-07-09 DAL2326 JAX → ATL Jul 9, 12:40 UTCJul 9, 13:25 UTC45m
2026-07-09 DAL724 - Jul 9, 00:35 UTCJul 9, 04:35 UTC4h 0m
2026-07-08 DAL363 JFK → SFO Jul 8, 15:20 UTCJul 8, 20:55 UTC5h 35m
2026-07-07 DAL791 SEA → MSP Jul 7, 19:00 UTCJul 7, 23:35 UTC4h 35m
2026-07-07 DAL791 SEA → MSP Jul 7, 18:57 UTCJul 7, 23:25 UTC4h 28m
2026-07-07 DAL791 SEA → MSP Jul 7, 13:05 UTCJul 7, 17:30 UTC4h 25m
2026-07-06 DAL396 SFO → JFK Jul 6, 23:20 UTCJul 7, 04:25 UTC5h 5m
2026-07-05 DAL363 ATL → MEX Jul 5, 15:35 UTCJul 5, 21:00 UTC5h 25m
2026-07-05 DAL363 ATL → MEX Jul 5, 15:30 UTCJul 5, 21:00 UTC5h 30m
2026-07-05 DAL791 SEA → MSP Jul 5, 05:40 UTCJul 5, 05:55 UTC15m
2026-07-05 DAL791 SEA → MSP Jul 5, 04:25 UTCJul 5, 05:55 UTC1h 30m
2026-07-04 DAL791 SEA → MSP Jul 4, 23:41 UTCJul 5, 05:24 UTC5h 43m
2026-07-04 DAL791 SEA → MSP Jul 4, 23:45 UTCJul 5, 04:20 UTC4h 35m
2026-07-04 DAL791 SEA → MSP Jul 4, 16:05 UTCJul 4, 20:35 UTC4h 30m
2026-07-04 DAL556 - Jul 4, 04:15 UTCJul 4, 09:05 UTC4h 50m
2026-07-04 DAL556 SNA → JFK Jul 4, 04:12 UTCJul 4, 09:01 UTC4h 49m
2026-07-03 DAL2012 - Jul 3, 22:00 UTCJul 4, 02:15 UTC4h 15m
2026-07-03 DAL2175 - Jul 3, 06:20 UTCJul 3, 10:25 UTC4h 5m
2026-07-02 DAL517 ATL → SFO Jul 2, 22:05 UTCJul 3, 02:55 UTC4h 50m
2026-07-02 DAL721 - Jul 2, 14:15 UTCJul 2, 18:05 UTC3h 50m
2026-07-02 DAL826 ATL → SNA Jul 2, 01:25 UTCJul 2, 05:45 UTC4h 20m
2026-07-01 DAL1521 - Jul 1, 19:55 UTCJul 1, 23:50 UTC3h 55m
2026-07-01 DAL1521 SNA → ATL Jul 1, 19:54 UTCJul 1, 23:49 UTC3h 55m
2026-07-01 DAL1857 - Jul 1, 13:25 UTCJul 1, 18:05 UTC4h 40m
2026-06-30 DAL1856 PLS → MSP Jun 30, 19:05 UTCJun 30, 22:50 UTC3h 45m
2026-06-30 DAL403 JFK → SNA Jun 30, 12:00 UTCJun 30, 17:05 UTC5h 5m
2026-06-29 DAL396 SFO → JFK Jun 29, 23:39 UTCJun 30, 04:45 UTC5h 6m
2026-06-29 DAL363 ATL → MEX Jun 29, 16:27 UTCJun 29, 22:05 UTC5h 38m
2026-06-29 DAL363 ATL → MEX Jun 29, 16:29 UTCJun 29, 22:15 UTC5h 45m
2026-06-29 DAL2112 BOS → MSY Jun 29, 08:04 UTCJun 29, 12:49 UTC4h 45m
2026-06-28 DAL667 - Jun 28, 23:39 UTCJun 29, 05:24 UTC5h 45m
2026-06-28 DAL383 OAK → JFK Jun 28, 16:09 UTCJun 28, 21:04 UTC4h 55m
2026-06-28 DAL383 SFO → JFK Jun 28, 16:06 UTCJun 28, 21:11 UTC5h 5m
2026-06-27 DAL667 - Jun 27, 23:39 UTCJun 28, 05:15 UTC5h 35m

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 N712TW page for operator, model, and routing details .

Mode-S A98539 frequently asked

What is Mode-S code A98539?
A98539 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N712TW.
Where is Mode-S A98539 registered?
Mode-S code A98539 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 A98539 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A98539, octal 52302471, decimal 11,109,689.
What flights does A98539 operate?
Mode-S A98539 has broadcast 20 distinct callsigns, including DAL667, DAL383, DAL791, DAL363, DAL329.