Apparatus

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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 2h ago
Flights observed
434
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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
DAL944 Delta Air Lines 5 2026-05-27
DAL592 Delta Air Lines 5 2026-06-01
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
DAL1913 Delta Air Lines 4 2026-05-30
DAL1652 Delta Air Lines 4 2026-04-16
DAL1514 Delta Air Lines 4 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2228 SLC → IND Jul 14, 00:10 UTCJul 14, 03:00 UTC2h 50m
2026-07-13 DAL1423 SMF → SLC Jul 13, 21:40 UTCJul 13, 22:55 UTC1h 15m
2026-07-13 DAL1423 SLC → SMF Jul 13, 19:00 UTCJul 13, 20:15 UTC1h 15m
2026-07-13 DAL1440 GEG → SLC Jul 13, 16:10 UTCJul 13, 17:30 UTC1h 20m
2026-07-13 DAL1466 SLC → GEG Jul 13, 13:45 UTCJul 13, 15:00 UTC1h 15m
2026-07-13 DAL1483 - Jul 13, 03:30 UTCJul 13, 04:55 UTC1h 25m
2026-07-12 DAL1161 SLC → LAX Jul 12, 23:30 UTCJul 13, 00:55 UTC1h 25m
2026-07-12 DAL1194 - Jul 12, 18:50 UTCJul 12, 20:15 UTC1h 25m
2026-07-12 DAL1194 LAX → SLC Jul 12, 18:49 UTCJul 12, 20:11 UTC1h 22m
2026-07-12 DAL1095 - Jul 12, 16:01 UTCJul 12, 17:25 UTC1h 25m
2026-07-12 DAL1095 SLC → LAX Jul 12, 15:59 UTCJul 12, 17:22 UTC1h 23m
2026-07-12 DAL2906 - Jul 12, 12:45 UTCJul 12, 14:05 UTC1h 20m
2026-07-12 DAL2854 SEA → LAX Jul 12, 03:30 UTCJul 12, 05:55 UTC2h 25m
2026-07-11 DAL871 SLC → SEA Jul 11, 23:45 UTCJul 12, 01:25 UTC1h 40m
2026-07-11 DAL871 SLC → SEA Jul 11, 23:43 UTCJul 12, 01:22 UTC1h 39m
2026-07-11 DAL1423 SMF → SLC Jul 11, 20:50 UTCJul 11, 22:05 UTC1h 15m
2026-07-11 DAL1423 SLC → SMF Jul 11, 17:45 UTCJul 11, 19:05 UTC1h 20m
2026-07-11 DAL2628 MSP → SLC Jul 11, 13:40 UTCJul 11, 15:55 UTC2h 15m
2026-07-11 DAL2789 - Jul 11, 07:55 UTCJul 11, 11:00 UTC3h 5m
2026-07-11 DAL2789 SFO → MSP Jul 11, 07:53 UTCJul 11, 11:03 UTC3h 10m
2026-07-11 DAL2986 - Jul 11, 05:40 UTCJul 11, 06:35 UTC55m
2026-07-10 DAL508 - Jul 10, 23:25 UTCJul 11, 03:55 UTC4h 30m
2026-07-10 DAL508 - Jul 10, 16:45 UTCJul 10, 21:45 UTC5h 1m
2026-07-10 DAL1598 SFO → LAX Jul 10, 14:15 UTCJul 10, 15:15 UTC1h 0m
2026-07-09 DAL509 - Jul 9, 23:35 UTCJul 10, 04:10 UTC4h 35m
2026-07-09 DAL509 DTW → SFO Jul 9, 23:31 UTCJul 10, 04:08 UTC4h 37m
2026-07-09 DAL618 CUN → DTW Jul 9, 17:55 UTCJul 9, 21:00 UTC3h 5m
2026-07-09 DAL619 - Jul 9, 13:20 UTCJul 9, 16:30 UTC3h 10m
2026-07-09 DAL619 DTW → CUN Jul 9, 13:16 UTCJul 9, 16:27 UTC3h 11m
2026-07-09 DAL1014 LGA → DTW Jul 9, 00:45 UTCJul 9, 01:55 UTC1h 10m
2026-07-09 DAL1014 LGA → DTW Jul 9, 00:43 UTCJul 9, 01:57 UTC1h 14m
2026-07-08 DAL2732 ATL → STL Jul 8, 20:50 UTCJul 8, 23:05 UTC2h 15m
2026-07-08 DAL536 SEA → MSP Jul 8, 16:35 UTCJul 8, 19:24 UTC2h 49m
2026-07-08 DAL536 SEA → MSP Jul 8, 16:35 UTCJul 8, 19:25 UTC2h 50m
2026-07-08 DAL814 DTW → SEA Jul 8, 10:10 UTCJul 8, 14:30 UTC4h 20m
2026-07-08 DAL1014 LGA → DTW Jul 8, 00:45 UTCJul 8, 02:00 UTC1h 15m
2026-07-07 DAL2732 ATL → STL Jul 7, 20:44 UTCJul 7, 22:50 UTC2h 6m
2026-07-07 DAL2732 ATL → STL Jul 7, 20:45 UTCJul 7, 22:50 UTC2h 5m
2026-07-07 DAL1766 MSP → ATL Jul 7, 16:00 UTCJul 7, 18:30 UTC2h 30m
2026-07-07 DAL1766 MSP → ATL Jul 7, 12:05 UTCJul 7, 14:15 UTC2h 10m
2026-07-07 DAL2180 JFK → TPA Jul 7, 07:15 UTCJul 7, 07:45 UTC30m
2026-07-07 DAL2180 JFK → TPA Jul 7, 02:20 UTCJul 7, 05:35 UTC3h 15m
2026-07-06 DAL2114 MSY → ATL Jul 6, 20:55 UTCJul 7, 00:15 UTC3h 20m
2026-07-06 DAL2261 ATL → BDL Jul 6, 16:45 UTCJul 6, 19:20 UTC2h 35m
2026-07-06 DAL2261 ATL → BDL Jul 6, 12:20 UTCJul 6, 15:00 UTC2h 40m
2026-07-06 DAL2699 RDU → MSP Jul 6, 00:15 UTCJul 6, 02:30 UTC2h 15m
2026-07-05 DAL2699 MSP → RDU Jul 5, 20:45 UTCJul 5, 22:50 UTC2h 5m
2026-07-05 DAL2697 - Jul 5, 18:05 UTCJul 5, 19:20 UTC1h 15m
2026-07-05 DAL1432 BOS → DTW Jul 5, 00:05 UTCJul 5, 01:45 UTC1h 40m
2026-07-04 DAL1171 - Jul 4, 18:30 UTCJul 4, 19:50 UTC1h 20m

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 2h ago.
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, DAL944.