Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACF4E8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N934DZ · operated by DELTA AIR LINES INC

Hex
ACF4E8
Octal
53172350
Decimal
11,334,888
Country
US
Tail
N934DZ
Type
B739
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
510
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S ACF4E8.

Country allocation

The ICAO 24-bit address ACF4E8 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
DAL2323 - 10 2026-06-23
DAL1528 - 7 2026-06-26
DAL532 - 6 2026-06-28
DAL3125 Delta Air Lines 6 2026-06-08
DAL2908 - 6 2026-07-17
DAL944 Delta Air Lines 5 2026-05-27
DAL592 Delta Air Lines 5 2026-06-01
DAL2951 - 5 2026-07-20
DAL2638 Delta Air Lines 5 2026-05-03
DAL2500 - 5 2026-06-21
DAL2346 Delta Air Lines 5 2026-06-26
DAL2042 - 5 2026-06-20
DAL1699 Delta Air Lines 5 2026-05-21
DAL909 Delta Air Lines 4 2026-05-18
DAL728 Delta Air Lines 4 2026-05-03
DAL539 Delta Air Lines 4 2026-06-02
DAL305 - 4 2026-06-22
DAL2854 - 4 2026-07-12
DAL2462 - 4 2026-06-29
DAL2418 Delta Air Lines 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2129 LGA → ORD Jul 26, 20:05 UTCJul 26, 22:00 UTC1h 55m
2026-07-26 DAL2129 LGA → ORD Jul 26, 14:10 UTCJul 26, 17:05 UTC2h 55m
2026-07-26 DAL2757 BDL → ATL Jul 26, 11:15 UTCJul 26, 12:40 UTC1h 25m
2026-07-26 DAL674 LAX → SEA Jul 26, 01:10 UTCJul 26, 02:15 UTC1h 5m
2026-07-25 DAL1766 MSP → ATL Jul 25, 20:20 UTCJul 25, 22:55 UTC2h 35m
2026-07-25 DAL1766 MSP → ATL Jul 25, 15:20 UTCJul 25, 17:40 UTC2h 20m
2026-07-25 DAL2221 PHL → MSP Jul 25, 11:15 UTCJul 25, 13:05 UTC1h 50m
2026-07-25 DAL858 EWR → ATL Jul 25, 01:35 UTCJul 25, 05:05 UTC3h 30m
2026-07-25 DAL858 EWR → ATL Jul 25, 01:32 UTCJul 25, 05:05 UTC3h 33m
2026-07-24 DAL355 JFK → LAX Jul 24, 20:15 UTCJul 24, 23:55 UTC3h 40m
2026-07-24 DAL2214 FLL → LGA Jul 24, 15:45 UTCJul 24, 18:00 UTC2h 15m
2026-07-24 DAL2214 FLL → LGA Jul 24, 15:44 UTCJul 24, 18:35 UTC2h 51m
2026-07-24 DAL1440 PDX → LAX Jul 24, 12:25 UTCJul 24, 13:35 UTC1h 10m
2026-07-24 DAL2418 SFO → DTW Jul 24, 03:10 UTCJul 24, 06:00 UTC2h 50m
2026-07-24 DAL2418 SFO → DTW Jul 24, 03:09 UTCJul 24, 05:49 UTC2h 40m
2026-07-23 DAL2015 CUN → DTW Jul 23, 22:15 UTCJul 24, 00:00 UTC1h 45m
2026-07-23 DAL2015 CUN → DTW Jul 23, 22:14 UTCJul 24, 00:47 UTC2h 33m
2026-07-23 DAL2756 MSP → LGA Jul 23, 18:30 UTCJul 23, 20:30 UTC2h 0m
2026-07-23 DAL1615 GEG → MSP Jul 23, 14:15 UTCJul 23, 16:30 UTC2h 15m
2026-07-23 DAL1466 MCO → MSP Jul 23, 06:25 UTCJul 23, 07:40 UTC1h 15m
2026-07-23 DAL1483 DTW → PHX Jul 23, 03:45 UTCJul 23, 05:10 UTC1h 25m
2026-07-22 DAL1161 DFW → LGA Jul 22, 23:35 UTCJul 23, 01:05 UTC1h 30m
2026-07-22 DAL2651 MSP → SLC Jul 22, 17:55 UTCJul 22, 20:10 UTC2h 15m
2026-07-22 DAL943 SEA → MSP Jul 22, 13:15 UTCJul 22, 15:55 UTC2h 40m
2026-07-22 DAL943 SEA → MSP Jul 22, 13:15 UTCJul 22, 15:53 UTC2h 38m
2026-07-21 DAL637 - Jul 21, 23:25 UTCJul 22, 03:25 UTC4h 0m
2026-07-21 DAL637 SEA → ORD Jul 21, 18:00 UTCJul 21, 21:15 UTC3h 15m
2026-07-21 DAL354 JFK → SLC Jul 21, 10:50 UTCJul 21, 16:05 UTC5h 15m
2026-07-21 DAL354 JFK → SLC Jul 21, 10:47 UTCJul 21, 16:04 UTC5h 17m
2026-07-21 DAL3244 ATL → RDU Jul 21, 01:35 UTCJul 21, 02:45 UTC1h 10m
2026-07-20 DAL3142 BNA → ATL Jul 20, 23:10 UTCJul 21, 00:00 UTC50m
2026-07-20 DAL3142 ATL → BNA Jul 20, 21:05 UTCJul 20, 21:40 UTC35m
2026-07-20 DAL2951 - Jul 20, 15:45 UTCJul 20, 17:30 UTC1h 45m
2026-07-20 DAL2951 BDL → ATL Jul 20, 15:41 UTCJul 20, 17:30 UTC1h 49m
2026-07-20 DAL2951 - Jul 20, 12:20 UTCJul 20, 14:15 UTC1h 55m
2026-07-20 DAL2966 ORF → ATL Jul 20, 09:25 UTCJul 20, 10:35 UTC1h 10m
2026-07-20 DAL2966 ORF → ATL Jul 20, 09:23 UTCJul 20, 10:40 UTC1h 17m
2026-07-20 DAL2984 ATL → ORF Jul 20, 01:15 UTCJul 20, 02:35 UTC1h 20m
2026-07-19 DAL2720 - Jul 19, 22:50 UTCJul 19, 23:35 UTC45m
2026-07-19 DAL2720 JAX → ATL Jul 19, 22:46 UTCJul 19, 23:34 UTC48m
2026-07-19 DAL2720 - Jul 19, 20:20 UTCJul 19, 21:05 UTC45m
2026-07-19 DAL2999 RDU → BOS Jul 19, 16:00 UTCJul 19, 17:45 UTC1h 45m
2026-07-19 DAL2999 RDU → BOS Jul 19, 13:10 UTCJul 19, 14:40 UTC1h 30m
2026-07-19 DAL3038 - Jul 19, 10:55 UTCJul 19, 11:30 UTC35m
2026-07-19 DAL3038 CAE → ATL Jul 19, 10:51 UTCJul 19, 11:25 UTC34m
2026-07-19 DAL3029 - Jul 19, 03:00 UTCJul 19, 03:35 UTC35m
2026-07-18 DAL1828 SJD → ATL Jul 18, 21:55 UTCJul 19, 00:50 UTC2h 55m
2026-07-18 DAL1945 - Jul 18, 15:55 UTCJul 18, 18:20 UTC2h 25m
2026-07-18 DAL1945 ATL → SJD Jul 18, 15:55 UTCJul 18, 19:25 UTC3h 30m
2026-07-18 DAL2451 - Jul 18, 12:45 UTCJul 18, 13:30 UTC45m

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 N934DZ page for operator, model, and routing details .

Mode-S ACF4E8 frequently asked

What is Mode-S code ACF4E8?
ACF4E8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N934DZ.
Where is Mode-S ACF4E8 registered?
Mode-S code ACF4E8 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 ACF4E8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF4E8, octal 53172350, decimal 11,334,888.
What flights does ACF4E8 operate?
Mode-S ACF4E8 has broadcast 20 distinct callsigns, including DAL2323, DAL1528, DAL532, DAL3125, DAL2908.