Apparatus

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sensors Mode-S transponder

ACC961

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N923AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
ACC961
Octal
53144541
Decimal
11,323,745
Country
US
Tail
N923AT
Type
B712
No current signal · last broadcast 3h ago
Flights observed
541
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S ACC961.

Country allocation

The ICAO 24-bit address ACC961 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
DAL940 - 9 2026-07-09
DAL3143 - 9 2026-07-09
DAL3051 - 9 2026-07-10
DAL1044 - 9 2026-07-11
DAL441 - 7 2026-07-08
DAL2741 Delta Air Lines 7 2026-05-21
DAL2163 Delta Air Lines 7 2026-07-02
DAL512 Delta Air Lines 6 2026-05-14
DAL2546 Delta Air Lines 6 2026-06-30
DAL2467 Delta Air Lines 6 2026-06-27
DAL1405 - 6 2026-07-04
DAL3150 Delta Air Lines 5 2026-06-27
DAL3077 - 5 2026-07-09
DAL2944 - 5 2026-06-23
DAL2868 - 5 2026-07-03
DAL2857 Delta Air Lines 5 2026-06-23
DAL2780 - 5 2026-06-22
DAL2763 - 5 2026-06-26
DAL2718 Delta Air Lines 5 2026-05-09
DAL2715 Delta Air Lines 5 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2241 - Jul 14, 00:15 UTCJul 14, 01:00 UTC45m
2026-07-13 DAL3014 SAV → ATL Jul 13, 21:15 UTCJul 13, 22:15 UTC1h 0m
2026-07-13 DAL3014 ATL → SAV Jul 13, 19:20 UTCJul 13, 20:10 UTC50m
2026-07-13 DAL1725 - Jul 13, 17:20 UTCJul 13, 18:00 UTC40m
2026-07-13 DAL1725 ATL → GSP Jul 13, 15:30 UTCJul 13, 16:00 UTC30m
2026-07-13 DAL1625 - Jul 13, 12:40 UTCJul 13, 13:35 UTC55m
2026-07-13 DAL2384 - Jul 13, 00:50 UTCJul 13, 01:40 UTC50m
2026-07-12 DAL3057 - Jul 12, 21:50 UTCJul 12, 22:15 UTC25m
2026-07-12 DAL3057 CHA → ATL Jul 12, 21:50 UTCJul 12, 22:16 UTC26m
2026-07-12 DAL3057 ATL → CHA Jul 12, 20:05 UTCJul 12, 20:30 UTC25m
2026-07-12 DAL2048 VPS → ATL Jul 12, 17:05 UTCJul 12, 18:10 UTC1h 5m
2026-07-12 DAL2048 VPS → ATL Jul 12, 17:02 UTCJul 12, 18:08 UTC1h 6m
2026-07-12 DAL2048 - Jul 12, 14:25 UTCJul 12, 15:10 UTC45m
2026-07-12 DAL2853 - Jul 12, 12:10 UTCJul 12, 12:45 UTC35m
2026-07-12 DAL3071 - Jul 12, 01:40 UTCJul 12, 02:15 UTC35m
2026-07-11 DAL2681 - Jul 11, 22:25 UTCJul 12, 00:10 UTC1h 45m
2026-07-11 DAL2681 MSN → ATL Jul 11, 22:22 UTCJul 12, 00:08 UTC1h 46m
2026-07-11 DAL2681 - Jul 11, 17:45 UTCJul 11, 19:35 UTC1h 50m
2026-07-11 DAL3100 - Jul 11, 14:20 UTCJul 11, 14:50 UTC30m
2026-07-11 DAL3100 - Jul 11, 12:35 UTCJul 11, 13:00 UTC25m
2026-07-11 DAL1044 - Jul 11, 09:50 UTCJul 11, 10:15 UTC25m
2026-07-11 DAL1044 CHA → ATL Jul 11, 09:49 UTCJul 11, 10:13 UTC24m
2026-07-11 DAL1059 ATL → CHA Jul 11, 03:30 UTCJul 11, 03:55 UTC25m
2026-07-11 DAL2837 - Jul 11, 00:35 UTCJul 11, 02:00 UTC1h 25m
2026-07-10 DAL2837 ATL → TUL Jul 10, 21:50 UTCJul 10, 23:20 UTC1h 30m
2026-07-10 DAL1347 - Jul 10, 18:45 UTCJul 10, 19:55 UTC1h 10m
2026-07-10 DAL1347 - Jul 10, 16:30 UTCJul 10, 17:30 UTC1h 0m
2026-07-10 DAL3051 - Jul 10, 14:30 UTCJul 10, 15:10 UTC40m
2026-07-10 DAL3051 VPS → ATL Jul 10, 14:25 UTCJul 10, 15:09 UTC44m
2026-07-10 DAL3051 - Jul 10, 12:30 UTCJul 10, 13:10 UTC40m
2026-07-10 DAL2556 - Jul 10, 10:40 UTCJul 10, 11:15 UTC35m
2026-07-10 DAL3065 ATL → HSV Jul 10, 01:50 UTCJul 10, 02:20 UTC30m
2026-07-09 DAL3143 - Jul 9, 23:20 UTCJul 10, 00:20 UTC1h 0m
2026-07-09 DAL3143 ATL → LEX Jul 9, 21:35 UTCJul 9, 22:20 UTC45m
2026-07-09 DAL940 - Jul 9, 18:10 UTCJul 9, 18:55 UTC45m
2026-07-09 DAL940 ATL → SAV Jul 9, 16:15 UTCJul 9, 16:55 UTC40m
2026-07-09 DAL3077 - Jul 9, 14:15 UTCJul 9, 14:50 UTC35m
2026-07-09 DAL3077 - Jul 9, 12:25 UTCJul 9, 12:55 UTC30m
2026-07-09 DAL2184 - Jul 9, 10:05 UTCJul 9, 11:05 UTC1h 0m
2026-07-08 DAL1235 ATL → LEX Jul 8, 22:10 UTCJul 8, 23:00 UTC50m
2026-07-08 DAL3193 - Jul 8, 20:15 UTCJul 8, 20:50 UTC35m
2026-07-08 DAL3193 - Jul 8, 18:25 UTCJul 8, 19:05 UTC40m
2026-07-08 DAL441 - Jul 8, 15:25 UTCJul 8, 17:20 UTC1h 55m
2026-07-08 DAL441 ATL → DAL Jul 8, 12:25 UTCJul 8, 14:10 UTC1h 45m
2026-07-08 DAL2407 - Jul 8, 10:00 UTCJul 8, 10:55 UTC55m
2026-07-07 DAL2831 ATL → SDF Jul 7, 21:55 UTCJul 7, 22:40 UTC45m
2026-07-07 DAL1060 - Jul 7, 18:45 UTCJul 7, 20:30 UTC1h 45m
2026-07-07 DAL1060 ATL → ICT Jul 7, 15:55 UTCJul 7, 17:40 UTC1h 45m
2026-07-07 DAL3036 - Jul 7, 13:50 UTCJul 7, 14:25 UTC35m
2026-07-07 DAL3036 ATL → HSV Jul 7, 12:15 UTCJul 7, 12:50 UTC35m

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 N923AT page for operator, model, and routing details .

Mode-S ACC961 frequently asked

What is Mode-S code ACC961?
ACC961 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N923AT.
Where is Mode-S ACC961 registered?
Mode-S code ACC961 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 ACC961 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACC961, octal 53144541, decimal 11,323,745.
What flights does ACC961 operate?
Mode-S ACC961 has broadcast 20 distinct callsigns, including DAL940, DAL3143, DAL3051, DAL1044, DAL441.