Apparatus

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sensors Mode-S transponder

A12861

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N174DN · BOEING 767-300 · operated by DELTA AIR LINES INC

Hex
A12861
Octal
50224141
Decimal
10,561,633
Country
US
Tail
N174DN
Type
B763
No current signal · last broadcast 1h ago
Flights observed
276
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A12861.

Country allocation

The ICAO 24-bit address A12861 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
DAL531 - 42 2026-07-11
DAL79 - 29 2026-07-14
DAL78 - 28 2026-07-13
DAL669 - 24 2026-07-11
DAL365 - 21 2026-07-11
DAL284 - 19 2026-07-13
DAL691 - 16 2026-07-12
DAL715 Delta Air Lines 15 2026-05-05
DAL285 - 15 2026-07-13
DAL823 Delta Air Lines 9 2026-06-06
DAL672 - 7 2026-07-12
DAL488 Delta Air Lines 7 2026-06-06
DAL680 Delta Air Lines 5 2026-05-04
DAL363 Delta Air Lines 5 2026-05-04
DAL416 Delta Air Lines 3 2026-06-11
DAL9973 Delta Air Lines 2 2026-06-20
DAL991 - 2 2026-06-27
DAL8784 Delta Air Lines 2 2026-05-20
DAL701 Delta Air Lines 2 2026-05-14
DAL670 Delta Air Lines 2 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL79 - Jul 14, 09:25 UTCJul 14, 11:55 UTC2h 30m
2026-07-13 DAL78 - Jul 13, 23:10 UTCJul 14, 06:55 UTC7h 45m
2026-07-13 DAL285 - Jul 13, 12:35 UTCJul 13, 18:45 UTC6h 10m
2026-07-13 DAL285 SNN → JFK Jul 13, 12:31 UTCJul 13, 18:49 UTC6h 18m
2026-07-13 DAL284 - Jul 13, 04:10 UTCJul 13, 05:55 UTC1h 45m
2026-07-13 DAL284 JFK → SNN Jul 13, 04:09 UTCJul 13, 10:06 UTC5h 57m
2026-07-12 DAL691 SFO → JFK Jul 12, 20:20 UTCJul 13, 01:35 UTC5h 15m
2026-07-12 DAL672 ATL → SFO Jul 12, 14:10 UTCJul 12, 18:30 UTC4h 20m
2026-07-11 DAL531 SFO → ATL Jul 11, 21:45 UTCJul 12, 02:05 UTC4h 20m
2026-07-11 DAL531 SFO → ATL Jul 11, 21:43 UTCJul 12, 02:07 UTC4h 24m
2026-07-11 DAL669 JFK → SFO Jul 11, 13:35 UTCJul 11, 19:15 UTC5h 40m
2026-07-11 DAL365 - Jul 11, 10:10 UTCJul 11, 10:30 UTC20m
2026-07-11 DAL365 - Jul 11, 05:45 UTCJul 11, 10:05 UTC4h 20m
2026-07-10 DAL365 JFK → SFO Jul 10, 21:20 UTCJul 11, 03:20 UTC6h 0m
2026-07-10 DAL79 PRG → JFK Jul 10, 09:30 UTCJul 10, 18:15 UTC8h 45m
2026-07-09 DAL78 JFK → PRG Jul 9, 23:15 UTCJul 10, 06:49 UTC7h 34m
2026-07-09 DAL78 - Jul 9, 23:15 UTCJul 10, 00:15 UTC1h 0m
2026-07-09 DAL285 - Jul 9, 12:15 UTCJul 9, 18:50 UTC6h 35m
2026-07-09 DAL284 - Jul 9, 04:25 UTCJul 9, 10:15 UTC5h 50m
2026-07-09 DAL284 JFK → SNN Jul 9, 04:24 UTCJul 9, 10:13 UTC5h 49m
2026-07-08 DAL79 PRG → JFK Jul 8, 12:00 UTCJul 8, 20:25 UTC8h 25m
2026-07-08 DAL79 PRG → JFK Jul 8, 11:59 UTCJul 8, 20:20 UTC8h 21m
2026-07-08 DAL78 JFK → PRG Jul 8, 01:00 UTCJul 8, 08:30 UTC7h 30m
2026-07-07 DAL285 - Jul 7, 12:20 UTCJul 7, 18:50 UTC6h 30m
2026-07-07 DAL284 - Jul 7, 05:00 UTCJul 7, 10:35 UTC5h 35m
2026-07-07 DAL284 JFK → SNN Jul 7, 04:56 UTCJul 7, 10:33 UTC5h 37m
2026-07-06 DAL691 - Jul 6, 21:40 UTCJul 7, 02:30 UTC4h 50m
2026-07-06 DAL672 ATL → SFO Jul 6, 14:50 UTCJul 6, 19:15 UTC4h 25m
2026-07-05 DAL531 SFO → ATL Jul 5, 21:55 UTCJul 6, 02:00 UTC4h 5m
2026-07-05 DAL669 JFK → SFO Jul 5, 14:50 UTCJul 5, 20:10 UTC5h 20m
2026-07-05 DAL691 - Jul 5, 06:10 UTCJul 5, 07:20 UTC1h 10m
2026-07-04 DAL691 - Jul 4, 23:05 UTCJul 5, 04:20 UTC5h 15m
2026-07-04 DAL669 JFK → SFO Jul 4, 13:35 UTCJul 4, 19:05 UTC5h 30m
2026-07-04 DAL365 SFO → JFK Jul 4, 06:30 UTCJul 4, 11:35 UTC5h 5m
2026-07-04 DAL365 SFO → JFK Jul 4, 06:27 UTCJul 4, 11:25 UTC4h 58m
2026-07-03 DAL365 JFK → SFO Jul 3, 21:15 UTCJul 4, 02:50 UTC5h 35m
2026-07-03 DAL79 PRG → JFK Jul 3, 09:10 UTCJul 3, 17:55 UTC8h 45m
2026-07-03 DAL79 PRG → JFK Jul 3, 09:08 UTCJul 3, 17:51 UTC8h 43m
2026-07-02 DAL78 JFK → PRG Jul 2, 23:45 UTCJul 3, 01:15 UTC1h 30m
2026-07-02 DAL78 JFK → PRG Jul 2, 23:44 UTCJul 3, 06:47 UTC7h 3m
2026-07-02 DAL285 - Jul 2, 12:20 UTCJul 2, 19:45 UTC7h 25m
2026-07-02 DAL285 SNN → JFK Jul 2, 12:18 UTCJul 2, 19:39 UTC7h 21m
2026-07-02 DAL284 - Jul 2, 04:05 UTCJul 2, 09:40 UTC5h 35m
2026-07-02 DAL284 JFK → SNN Jul 2, 04:05 UTCJul 2, 09:41 UTC5h 36m
2026-07-01 DAL79 PRG → JFK Jul 1, 09:45 UTCJul 1, 18:30 UTC8h 45m
2026-06-30 DAL78 JFK → PRG Jun 30, 23:05 UTCJul 1, 06:30 UTC7h 25m
2026-06-30 DAL285 - Jun 30, 12:20 UTCJun 30, 18:50 UTC6h 30m
2026-06-30 DAL284 - Jun 30, 03:55 UTCJun 30, 09:20 UTC5h 25m
2026-06-30 DAL284 JFK → SNN Jun 30, 03:52 UTCJun 30, 09:20 UTC5h 28m
2026-06-29 DAL691 SFO → JFK Jun 29, 20:19 UTCJun 30, 01:14 UTC4h 55m

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 N174DN page for operator, model, and routing details .

Mode-S A12861 frequently asked

What is Mode-S code A12861?
A12861 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N174DN.
Where is Mode-S A12861 registered?
Mode-S code A12861 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 A12861 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12861, octal 50224141, decimal 10,561,633.
What flights does A12861 operate?
Mode-S A12861 has broadcast 20 distinct callsigns, including DAL531, DAL79, DAL78, DAL669, DAL365.