Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AD4B54

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N956DZ · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AD4B54
Octal
53245524
Decimal
11,357,012
Country
US
Tail
N956DZ
Type
B739
No current signal · last broadcast 2h ago
Flights observed
595
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AD4B54.

Country allocation

The ICAO 24-bit address AD4B54 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
DAL2547 - 26 2026-07-10
DAL3107 - 21 2026-07-08
DAL2911 - 20 2026-07-10
DAL1381 - 20 2026-07-13
DAL2827 - 16 2026-06-29
DAL3196 Delta Air Lines 15 2026-06-06
DAL2471 - 15 2026-07-17
DAL1130 - 15 2026-07-15
DAL3110 - 13 2026-07-15
DAL2174 - 13 2026-07-11
DAL1660 Delta Air Lines 13 2026-06-06
DAL1470 - 13 2026-07-05
DAL527 - 12 2026-07-10
DAL2908 Delta Air Lines 12 2026-06-05
DAL1363 - 12 2026-07-13
DAL1204 - 12 2026-07-10
DAL3179 - 11 2026-07-15
DAL1700 Delta Air Lines 11 2026-05-07
DAL3035 Delta Air Lines 10 2026-04-29
DAL1750 - 10 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 DAL2810 - Jul 18, 04:25 UTCJul 18, 05:25 UTC1h 0m
2026-07-18 DAL1550 - Jul 18, 01:15 UTCJul 18, 02:09 UTC55m
2026-07-17 DAL1550 ATL → RDU Jul 17, 22:45 UTCJul 17, 23:45 UTC1h 0m
2026-07-17 DAL2471 MKC → ATL Jul 17, 15:49 UTCJul 17, 17:25 UTC1h 35m
2026-07-17 DAL2471 - Jul 17, 12:45 UTCJul 17, 14:10 UTC1h 25m
2026-07-17 DAL1504 - Jul 17, 09:55 UTCJul 17, 11:04 UTC1h 10m
2026-07-17 DAL1351 - Jul 17, 03:20 UTCJul 17, 04:29 UTC1h 10m
2026-07-17 DAL3059 - Jul 17, 00:40 UTCJul 17, 01:29 UTC50m
2026-07-17 DAL3059 PNS → ATL Jul 17, 00:36 UTCJul 17, 01:25 UTC49m
2026-07-16 DAL3059 - Jul 16, 22:59 UTCJul 16, 23:40 UTC40m
2026-07-16 DAL1067 SAV → ATL Jul 16, 20:19 UTCJul 16, 21:00 UTC40m
2026-07-16 DAL1067 ATL → SAV Jul 16, 18:19 UTCJul 16, 18:59 UTC40m
2026-07-16 DAL3091 - Jul 16, 15:45 UTCJul 16, 16:25 UTC40m
2026-07-16 DAL3091 CHS → ATL Jul 16, 15:43 UTCJul 16, 16:23 UTC40m
2026-07-16 DAL3091 - Jul 16, 13:20 UTCJul 16, 14:10 UTC50m
2026-07-16 DAL2124 - Jul 16, 10:25 UTCJul 16, 11:05 UTC40m
2026-07-16 DAL2124 CHS → ATL Jul 16, 10:20 UTCJul 16, 11:04 UTC44m
2026-07-15 DAL3179 - Jul 15, 22:05 UTCJul 15, 22:50 UTC45m
2026-07-15 DAL1750 - Jul 15, 18:55 UTCJul 15, 20:00 UTC1h 5m
2026-07-15 DAL1750 ATL → CMH Jul 15, 16:10 UTCJul 15, 17:20 UTC1h 10m
2026-07-15 DAL3110 - Jul 15, 13:15 UTCJul 15, 14:50 UTC1h 35m
2026-07-15 DAL1130 - Jul 15, 00:25 UTCJul 15, 02:05 UTC1h 40m
2026-07-14 DAL1488 - Jul 14, 21:40 UTCJul 14, 22:55 UTC1h 14m
2026-07-14 DAL1488 ATL → RDU Jul 14, 15:20 UTCJul 14, 16:15 UTC55m
2026-07-14 DAL1212 - Jul 14, 12:10 UTCJul 14, 13:45 UTC1h 35m
2026-07-14 DAL1130 - Jul 14, 00:25 UTCJul 14, 02:05 UTC1h 40m
2026-07-13 DAL1381 - Jul 13, 21:20 UTCJul 13, 22:10 UTC50m
2026-07-13 DAL1381 - Jul 13, 18:55 UTCJul 13, 19:45 UTC50m
2026-07-13 DAL1363 - Jul 13, 16:00 UTCJul 13, 17:30 UTC1h 30m
2026-07-13 DAL1363 ATL → PIT Jul 13, 13:20 UTCJul 13, 14:30 UTC1h 10m
2026-07-13 DAL1702 SAV → ATL Jul 13, 10:55 UTCJul 13, 11:35 UTC40m
2026-07-13 DAL1702 SAV → ATL Jul 13, 10:54 UTCJul 13, 11:33 UTC39m
2026-07-13 DAL2425 ATL → SAV Jul 13, 01:50 UTCJul 13, 02:37 UTC47m
2026-07-13 DAL2425 ATL → SAV Jul 13, 01:50 UTCJul 13, 02:40 UTC50m
2026-07-12 DAL1550 - Jul 12, 22:50 UTCJul 12, 23:45 UTC55m
2026-07-12 DAL1550 RDU → ATL Jul 12, 22:47 UTCJul 12, 23:44 UTC57m
2026-07-12 DAL1550 ATL → RDU Jul 12, 20:05 UTCJul 12, 21:00 UTC55m
2026-07-12 DAL3110 - Jul 12, 16:20 UTCJul 12, 17:55 UTC1h 35m
2026-07-12 DAL1130 - Jul 12, 04:15 UTCJul 12, 05:50 UTC1h 35m
2026-07-11 DAL1381 - Jul 11, 23:00 UTCJul 11, 23:40 UTC40m
2026-07-11 DAL1381 CHS → ATL Jul 11, 22:57 UTCJul 11, 23:43 UTC46m
2026-07-11 DAL1381 ATL → CHS Jul 11, 18:55 UTCJul 11, 19:45 UTC50m
2026-07-11 DAL1424 MSY → ATL Jul 11, 16:00 UTCJul 11, 17:05 UTC1h 5m
2026-07-11 DAL1424 MSY → ATL Jul 11, 16:01 UTCJul 11, 17:07 UTC1h 6m
2026-07-11 DAL1424 ATL → MSY Jul 11, 13:35 UTCJul 11, 14:40 UTC1h 5m
2026-07-11 DAL1702 SAV → ATL Jul 11, 11:10 UTCJul 11, 11:50 UTC40m
2026-07-11 DAL2425 ATL → SAV Jul 11, 02:40 UTCJul 11, 03:20 UTC40m
2026-07-11 DAL2174 - Jul 11, 00:10 UTCJul 11, 01:00 UTC50m
2026-07-10 DAL2174 - Jul 10, 20:40 UTCJul 10, 22:10 UTC1h 30m
2026-07-10 DAL2547 - Jul 10, 17:10 UTCJul 10, 18:35 UTC1h 25m

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 N956DZ page for operator, model, and routing details .

Mode-S AD4B54 frequently asked

What is Mode-S code AD4B54?
AD4B54 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N956DZ.
Where is Mode-S AD4B54 registered?
Mode-S code AD4B54 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 AD4B54 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4B54, octal 53245524, decimal 11,357,012.
What flights does AD4B54 operate?
Mode-S AD4B54 has broadcast 20 distinct callsigns, including DAL2547, DAL3107, DAL2911, DAL1381, DAL2827.