Apparatus

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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
Broadcasting now · callsign DAL3110 · 37,000 ft
Flights observed
655
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

AD4B54 is currently broadcasting. Map zoomed to live position.

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
DAL1381 Delta Air Lines 25 2026-07-25
DAL3107 - 21 2026-07-08
DAL2471 Delta Air Lines 21 2026-07-24
DAL2911 - 20 2026-07-10
DAL1130 Delta Air Lines 17 2026-07-26
DAL2827 - 16 2026-06-29
DAL3196 Delta Air Lines 15 2026-06-06
DAL3110 Delta Air Lines 14 2026-07-26
DAL1067 - 14 2026-07-23
DAL2174 - 13 2026-07-11
DAL1660 Delta Air Lines 13 2026-06-06
DAL1470 - 13 2026-07-05
DAL527 - 12 2026-07-10
DAL3179 Delta Air Lines 12 2026-07-26
DAL3091 - 12 2026-07-22
DAL2908 Delta Air Lines 12 2026-06-05
DAL1750 Delta Air Lines 12 2026-07-26
DAL1550 Delta Air Lines 12 2026-07-24
DAL1363 - 12 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL3179 GSO → ATL Jul 26, 21:45 UTCJul 26, 22:30 UTC45m
2026-07-26 DAL1750 MSP → MYR Jul 26, 18:50 UTCJul 26, 19:50 UTC1h 0m
2026-07-26 DAL1750 MSP → MYR Jul 26, 16:15 UTCJul 26, 17:20 UTC1h 5m
2026-07-26 DAL3110 MCI → ATL Jul 26, 13:15 UTCJul 26, 14:50 UTC1h 35m
2026-07-26 DAL1130 DEN → MSP Jul 26, 00:00 UTCJul 26, 01:40 UTC1h 40m
2026-07-25 DAL1381 BOS → MCO Jul 25, 21:25 UTCJul 25, 22:05 UTC40m
2026-07-25 DAL1381 BOS → MCO Jul 25, 21:21 UTCJul 25, 22:05 UTC44m
2026-07-25 DAL1381 BOS → MCO Jul 25, 19:05 UTCJul 25, 19:55 UTC50m
2026-07-25 DAL1424 PBI → LGA Jul 25, 16:15 UTCJul 25, 17:20 UTC1h 5m
2026-07-25 DAL1424 PBI → LGA Jul 25, 13:40 UTCJul 25, 14:40 UTC1h 0m
2026-07-25 DAL1702 BOS → MCI Jul 25, 11:15 UTCJul 25, 11:55 UTC40m
2026-07-25 DAL2425 BOS → FLL Jul 25, 01:55 UTCJul 25, 02:30 UTC35m
2026-07-25 DAL2425 BOS → FLL Jul 25, 01:53 UTCJul 25, 02:29 UTC36m
2026-07-24 DAL1550 AUS → BOS Jul 24, 23:25 UTCJul 25, 00:25 UTC1h 0m
2026-07-24 DAL1550 AUS → BOS Jul 24, 19:23 UTCJul 24, 20:16 UTC53m
2026-07-24 DAL1550 AUS → BOS Jul 24, 19:25 UTCJul 24, 20:20 UTC55m
2026-07-24 DAL2471 LEX → ATL Jul 24, 16:00 UTCJul 24, 17:30 UTC1h 30m
2026-07-24 DAL2471 LEX → ATL Jul 24, 12:40 UTCJul 24, 14:25 UTC1h 45m
2026-07-24 DAL1504 BOS → JAX Jul 24, 10:10 UTCJul 24, 11:25 UTC1h 15m
2026-07-24 DAL1351 SJC → ATL Jul 24, 03:05 UTCJul 24, 04:20 UTC1h 15m
2026-07-24 DAL1351 SJC → ATL Jul 24, 03:05 UTCJul 24, 04:18 UTC1h 13m
2026-07-24 DAL3059 PNS → ATL Jul 24, 00:35 UTCJul 24, 01:20 UTC45m
2026-07-23 DAL3059 PNS → ATL Jul 23, 22:45 UTCJul 23, 23:30 UTC45m
2026-07-23 DAL1067 SAV → ATL Jul 23, 20:45 UTCJul 23, 21:25 UTC40m
2026-07-23 DAL1067 ATL → SAV Jul 23, 18:45 UTCJul 23, 19:25 UTC40m
2026-07-23 DAL2471 LEX → ATL Jul 23, 15:50 UTCJul 23, 17:20 UTC1h 30m
2026-07-23 DAL2471 LEX → ATL Jul 23, 12:45 UTCJul 23, 14:25 UTC1h 40m
2026-07-23 DAL1504 BOS → JAX Jul 23, 09:55 UTCJul 23, 11:00 UTC1h 5m
2026-07-23 DAL1504 BOS → JAX Jul 23, 09:50 UTCJul 23, 11:09 UTC1h 19m
2026-07-22 DAL3122 - Jul 22, 23:00 UTCJul 23, 00:10 UTC1h 10m
2026-07-22 DAL1067 SAV → ATL Jul 22, 19:55 UTCJul 22, 20:30 UTC35m
2026-07-22 DAL1067 ATL → SAV Jul 22, 17:40 UTCJul 22, 18:25 UTC45m
2026-07-22 DAL3091 - Jul 22, 15:35 UTCJul 22, 16:15 UTC40m
2026-07-22 DAL3091 CHS → ATL Jul 22, 15:31 UTCJul 22, 16:12 UTC41m
2026-07-22 DAL3091 - Jul 22, 13:15 UTCJul 22, 13:55 UTC40m
2026-07-21 DAL3122 - Jul 21, 22:55 UTCJul 22, 00:35 UTC1h 40m
2026-07-21 DAL1067 SAV → ATL Jul 21, 20:00 UTCJul 21, 20:40 UTC40m
2026-07-21 DAL1067 ATL → SAV Jul 21, 18:00 UTCJul 21, 18:35 UTC35m
2026-07-21 DAL3091 - Jul 21, 15:45 UTCJul 21, 16:35 UTC50m
2026-07-21 DAL3091 - Jul 21, 13:15 UTCJul 21, 13:55 UTC40m
2026-07-21 DAL1702 SAV → ATL Jul 21, 10:45 UTCJul 21, 11:30 UTC45m
2026-07-21 DAL2425 BOS → FLL Jul 21, 00:40 UTCJul 21, 01:20 UTC40m
2026-07-20 DAL1550 RDU → ATL Jul 20, 22:20 UTCJul 20, 23:20 UTC1h 0m
2026-07-20 DAL1550 ATL → RDU Jul 20, 19:05 UTCJul 20, 20:10 UTC1h 5m
2026-07-20 DAL2471 - Jul 20, 15:50 UTCJul 20, 17:20 UTC1h 30m
2026-07-20 DAL2471 - Jul 20, 12:55 UTCJul 20, 14:30 UTC1h 35m
2026-07-20 DAL1504 BOS → JAX Jul 20, 10:00 UTCJul 20, 11:10 UTC1h 10m
2026-07-20 DAL1351 ATL → PIT Jul 20, 04:05 UTCJul 20, 05:20 UTC1h 15m
2026-07-20 DAL719 BNA → ATL Jul 20, 01:15 UTCJul 20, 01:55 UTC40m
2026-07-19 DAL719 ATL → BNA Jul 19, 22:00 UTCJul 19, 23:10 UTC1h 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 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?
Yes. Mode-S AD4B54 is currently airborne.
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, DAL1381, DAL3107, DAL2471, DAL2911.