Apparatus

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sensors Mode-S transponder

ACDFFC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N929DZ · BOEING 737-900 · operated by BANK OF UTAH TRUSTEE

Hex
ACDFFC
Octal
53157774
Decimal
11,329,532
Country
US
Tail
N929DZ
Type
B739
No current signal · last broadcast Jul 24, 23:45 UTC
Flights observed
512
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 23:45 UTC

Last known position

Most recent position reported by Mode-S ACDFFC.

Country allocation

The ICAO 24-bit address ACDFFC 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
DAL1600 Delta Air Lines 9 2026-04-18
DAL1679 Delta Air Lines 7 2026-04-18
DAL361 Delta Air Lines 6 2026-04-14
DAL1008 - 6 2026-07-20
DAL3100 Delta Air Lines 5 2026-06-28
DAL2951 - 5 2026-06-29
DAL2824 Delta Air Lines 5 2026-04-29
DAL2531 Delta Air Lines 5 2026-07-07
DAL2449 Delta Air Lines 5 2026-04-28
DAL1949 Delta Air Lines 5 2026-07-19
DAL902 - 4 2026-06-18
DAL656 Delta Air Lines 4 2026-07-20
DAL553 - 4 2026-07-15
DAL3146 Delta Air Lines 4 2026-06-29
DAL2711 - 4 2026-06-26
DAL2653 - 4 2026-07-15
DAL2404 Delta Air Lines 4 2026-04-27
DAL1978 Delta Air Lines 4 2026-07-19
DAL1409 Delta Air Lines 4 2026-04-28
DAL1153 Delta Air Lines 4 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 DAL1031 ATL → CHS Jul 24, 22:15 UTCJul 24, 23:45 UTC1h 30m
2026-07-24 DAL1031 ATL → CHS Jul 24, 22:13 UTCJul 24, 23:41 UTC1h 28m
2026-07-24 DAL566 DFW → LGA Jul 24, 18:55 UTCJul 24, 20:45 UTC1h 50m
2026-07-24 DAL566 DFW → LGA Jul 24, 15:50 UTCJul 24, 17:10 UTC1h 20m
2026-07-24 DAL1383 ATL → EWR Jul 24, 13:10 UTCJul 24, 14:35 UTC1h 25m
2026-07-23 DAL1380 BOS → LGA Jul 23, 11:55 UTCJul 23, 13:15 UTC1h 20m
2026-07-23 DAL3025 ATL → LIT Jul 23, 00:05 UTCJul 23, 01:15 UTC1h 10m
2026-07-22 DAL3025 ATL → LIT Jul 22, 21:30 UTCJul 22, 22:25 UTC55m
2026-07-22 DAL2978 MSP → YYC Jul 22, 18:15 UTCJul 22, 19:45 UTC1h 30m
2026-07-22 DAL2978 MSP → YYC Jul 22, 13:55 UTCJul 22, 15:15 UTC1h 20m
2026-07-22 DAL1664 EGE → ATL Jul 22, 11:35 UTCJul 22, 12:15 UTC40m
2026-07-22 DAL1664 EGE → ATL Jul 22, 11:30 UTCJul 22, 12:16 UTC46m
2026-07-21 DAL2493 - Jul 21, 23:55 UTCJul 22, 00:35 UTC40m
2026-07-21 DAL2545 - Jul 21, 20:45 UTCJul 21, 22:25 UTC1h 40m
2026-07-21 DAL2545 ATL → CLE Jul 21, 17:45 UTCJul 21, 19:05 UTC1h 20m
2026-07-21 DAL886 CVG → SEA Jul 21, 13:05 UTCJul 21, 16:15 UTC3h 10m
2026-07-21 DAL1251 ATL → TUS Jul 21, 01:45 UTCJul 21, 04:55 UTC3h 10m
2026-07-21 DAL1251 ATL → TUS Jul 21, 01:45 UTCJul 21, 04:50 UTC3h 5m
2026-07-20 DAL1008 - Jul 20, 23:10 UTCJul 21, 00:15 UTC1h 5m
2026-07-20 DAL1008 ATL → CVG Jul 20, 19:30 UTCJul 20, 20:35 UTC1h 5m
2026-07-20 DAL570 - Jul 20, 13:30 UTCJul 20, 17:45 UTC4h 15m
2026-07-20 DAL656 ATL → BDA Jul 20, 05:25 UTCJul 20, 09:35 UTC4h 10m
2026-07-20 DAL656 ATL → BDA Jul 20, 05:25 UTCJul 20, 09:33 UTC4h 8m
2026-07-19 DAL1949 ATL → MBJ Jul 19, 19:40 UTCJul 20, 02:00 UTC6h 20m
2026-07-19 DAL1688 ABQ → ATL Jul 19, 13:10 UTCJul 19, 16:00 UTC2h 50m
2026-07-19 DAL1531 IAH → LGA Jul 19, 03:30 UTCJul 19, 06:00 UTC2h 30m
2026-07-19 DAL1978 SAL → ATL Jul 19, 00:35 UTCJul 19, 01:00 UTC25m
2026-07-19 DAL1978 SAL → ATL Jul 19, 00:32 UTCJul 19, 01:11 UTC39m
2026-07-18 DAL1978 SAL → ATL Jul 18, 20:00 UTCJul 18, 23:30 UTC3h 30m
2026-07-18 DAL1910 - Jul 18, 15:10 UTCJul 18, 18:00 UTC2h 50m
2026-07-18 DAL1396 - Jul 18, 12:05 UTCJul 18, 13:05 UTC1h 0m
2026-07-18 DAL2701 - Jul 18, 02:45 UTCJul 18, 03:40 UTC56m
2026-07-17 DAL1978 SAL → ATL Jul 17, 20:20 UTCJul 17, 23:30 UTC3h 10m
2026-07-17 DAL1910 - Jul 17, 15:35 UTCJul 17, 18:25 UTC2h 50m
2026-07-17 DAL3165 - Jul 17, 12:19 UTCJul 17, 13:25 UTC1h 5m
2026-07-17 DAL1545 ATL → CMH Jul 17, 01:20 UTCJul 17, 02:25 UTC1h 5m
2026-07-17 DAL1545 ATL → CMH Jul 17, 01:17 UTCJul 17, 02:24 UTC1h 7m
2026-07-16 DAL2720 - Jul 16, 22:19 UTCJul 16, 23:25 UTC1h 5m
2026-07-16 DAL2720 JAX → ATL Jul 16, 22:18 UTCJul 16, 23:18 UTC1h 0m
2026-07-16 DAL2720 - Jul 16, 19:30 UTCJul 16, 20:19 UTC50m
2026-07-16 DAL677 LAS → ATL Jul 16, 14:20 UTCJul 16, 18:00 UTC3h 40m
2026-07-16 DAL2202 - Jul 16, 03:20 UTCJul 16, 04:05 UTC45m
2026-07-15 DAL861 - Jul 15, 21:35 UTCJul 16, 01:15 UTC3h 40m
2026-07-15 DAL861 - Jul 15, 16:25 UTCJul 15, 20:05 UTC3h 40m
2026-07-15 DAL553 - Jul 15, 13:55 UTCJul 15, 14:40 UTC45m
2026-07-15 DAL553 LAS → LAX Jul 15, 13:55 UTCJul 15, 14:32 UTC37m
2026-07-15 DAL2653 - Jul 15, 05:05 UTCJul 15, 05:55 UTC50m
2026-07-15 DAL2653 LAX → LAS Jul 15, 05:03 UTCJul 15, 05:52 UTC49m
2026-07-15 DAL2288 LAS → LAX Jul 15, 02:15 UTCJul 15, 03:00 UTC45m
2026-07-14 DAL711 ATL → LAS Jul 14, 20:59 UTCJul 15, 00:38 UTC3h 39m

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 N929DZ page for operator, model, and routing details .

Mode-S ACDFFC frequently asked

What is Mode-S code ACDFFC?
ACDFFC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N929DZ.
Where is Mode-S ACDFFC registered?
Mode-S code ACDFFC 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 ACDFFC broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 23:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACDFFC, octal 53157774, decimal 11,329,532.
What flights does ACDFFC operate?
Mode-S ACDFFC has broadcast 20 distinct callsigns, including DAL1600, DAL1679, DAL361, DAL1008, DAL3100.