Apparatus

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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
Broadcasting now · callsign DAL392 · 37,000 ft
Flights observed
338
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A98539 is currently broadcasting. Map zoomed to live position.

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
DAL791 Delta Air Lines 17 2026-07-20
DAL667 - 17 2026-07-12
DAL383 - 16 2026-07-12
DAL329 Delta Air Lines 15 2026-07-18
DAL363 - 14 2026-07-13
DAL2112 - 13 2026-07-13
DAL2012 Delta Air Lines 12 2026-07-26
DAL392 Delta Air Lines 11 2026-07-17
DAL987 - 10 2026-07-14
DAL1732 Delta Air Lines 10 2026-07-21
DAL823 Delta Air Lines 9 2026-05-01
DAL507 - 8 2026-07-18
DAL2286 Delta Air Lines 8 2026-05-06
DAL1521 Delta Air Lines 8 2026-07-25
DAL923 Delta Air Lines 7 2026-04-30
DAL570 Delta Air Lines 7 2026-05-01
DAL556 Delta Air Lines 7 2026-07-25
DAL479 - 7 2026-07-15
DAL437 - 7 2026-07-15
DAL403 Delta Air Lines 7 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2012 MSP → RDU Jul 26, 21:45 UTCJul 26, 22:15 UTC30m
2026-07-26 DAL721 SFO → ATL Jul 26, 15:25 UTCJul 26, 19:20 UTC3h 55m
2026-07-26 DAL826 BOS → DTW Jul 26, 01:45 UTCJul 26, 05:30 UTC3h 45m
2026-07-25 DAL1521 MCI → DTW Jul 25, 19:55 UTCJul 26, 00:10 UTC4h 15m
2026-07-25 DAL1521 MCI → DTW Jul 25, 19:53 UTCJul 26, 00:08 UTC4h 15m
2026-07-25 DAL403 ATL → RDU Jul 25, 13:05 UTCJul 25, 18:05 UTC5h 0m
2026-07-25 DAL556 LGA → ORD Jul 25, 04:10 UTCJul 25, 08:50 UTC4h 40m
2026-07-24 DAL2012 MSP → RDU Jul 24, 21:45 UTCJul 25, 01:35 UTC3h 50m
2026-07-24 DAL721 SFO → ATL Jul 24, 14:30 UTCJul 24, 19:00 UTC4h 30m
2026-07-24 DAL826 BOS → DTW Jul 24, 01:30 UTCJul 24, 05:25 UTC3h 55m
2026-07-23 DAL1521 MCI → DTW Jul 23, 19:35 UTCJul 23, 23:40 UTC4h 5m
2026-07-23 DAL1521 MCI → DTW Jul 23, 19:30 UTCJul 23, 23:36 UTC4h 6m
2026-07-23 DAL1857 - Jul 23, 13:45 UTCJul 23, 17:55 UTC4h 10m
2026-07-22 DAL1856 PLS → MSP Jul 22, 18:50 UTCJul 22, 22:45 UTC3h 55m
2026-07-22 DAL403 ATL → RDU Jul 22, 12:00 UTCJul 22, 17:15 UTC5h 15m
2026-07-22 DAL396 LGA → ATL Jul 22, 00:20 UTCJul 22, 05:20 UTC5h 0m
2026-07-21 DAL1732 JAX → BOS Jul 21, 02:20 UTCJul 21, 08:00 UTC5h 40m
2026-07-21 DAL1732 JAX → BOS Jul 21, 02:15 UTCJul 21, 07:54 UTC5h 39m
2026-07-20 DAL791 SEA → MSP Jul 20, 18:55 UTCJul 20, 23:20 UTC4h 25m
2026-07-20 DAL791 SEA → MSP Jul 20, 13:00 UTCJul 20, 17:35 UTC4h 35m
2026-07-20 DAL396 LGA → ATL Jul 20, 00:40 UTCJul 20, 05:35 UTC4h 55m
2026-07-19 DAL750 ATL → SFO Jul 19, 17:15 UTCJul 19, 21:35 UTC4h 20m
2026-07-19 DAL750 ATL → SFO Jul 19, 17:13 UTCJul 19, 21:32 UTC4h 19m
2026-07-18 DAL329 SJU → MSP Jul 18, 21:05 UTCJul 19, 01:05 UTC4h 0m
2026-07-18 DAL329 SJU → MSP Jul 18, 15:10 UTCJul 18, 18:55 UTC3h 45m
2026-07-18 DAL695 BOS → LAS Jul 18, 10:55 UTCJul 18, 13:00 UTC2h 5m
2026-07-18 DAL507 - Jul 18, 04:20 UTCJul 18, 09:20 UTC5h 0m
2026-07-17 DAL392 DCA → LAX Jul 17, 21:30 UTCJul 18, 02:09 UTC4h 40m
2026-07-17 DAL392 DCA → LAX Jul 17, 14:39 UTCJul 17, 19:40 UTC5h 0m
2026-07-16 DAL318 - Jul 16, 21:00 UTCJul 17, 02:20 UTC5h 20m
2026-07-16 DAL318 BOS → LAX Jul 16, 20:59 UTCJul 17, 02:18 UTC5h 19m
2026-07-16 DAL639 - Jul 16, 13:49 UTCJul 16, 19:05 UTC5h 15m
2026-07-16 DAL321 - Jul 16, 01:30 UTCJul 16, 06:55 UTC5h 25m
2026-07-15 DAL437 - Jul 15, 18:10 UTCJul 15, 23:30 UTC5h 20m
2026-07-15 DAL479 - Jul 15, 11:30 UTCJul 15, 16:40 UTC5h 10m
2026-07-15 DAL479 BOS → LAX Jul 15, 11:27 UTCJul 15, 16:34 UTC5h 7m
2026-07-14 DAL2166 - Jul 14, 22:35 UTCJul 15, 03:40 UTC5h 4m
2026-07-14 DAL2004 - Jul 14, 15:45 UTCJul 14, 20:50 UTC5h 5m
2026-07-14 DAL2004 BOS → LAX Jul 14, 15:41 UTCJul 14, 20:48 UTC5h 7m
2026-07-14 DAL987 ATL → BOS Jul 14, 11:25 UTCJul 14, 13:40 UTC2h 15m
2026-07-14 DAL987 ATL → BOS Jul 14, 11:25 UTCJul 14, 13:44 UTC2h 19m
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

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?
Yes. Mode-S A98539 is currently airborne.
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 DAL791, DAL667, DAL383, DAL329, DAL363.