Apparatus

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sensors Mode-S transponder

ACF131

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N933DZ · operated by DELTA AIR LINES INC

Hex
ACF131
Octal
53170461
Decimal
11,333,937
Country
US
Tail
N933DZ
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
501
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S ACF131.

Country allocation

The ICAO 24-bit address ACF131 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
DAL728 - 8 2026-07-12
DAL2058 Delta Air Lines 8 2026-07-07
DAL637 - 7 2026-07-13
DAL481 - 5 2026-06-21
DAL3104 Delta Air Lines 5 2026-04-30
DAL3019 - 5 2026-07-10
DAL2999 Delta Air Lines 5 2026-05-20
DAL2738 - 5 2026-06-19
DAL2699 - 5 2026-06-28
DAL2651 - 5 2026-07-11
DAL1445 - 5 2026-07-23
DAL1109 Delta Air Lines 5 2026-05-20
DAL904 - 4 2026-07-10
DAL787 Delta Air Lines 4 2026-07-25
DAL682 - 4 2026-07-11
DAL3109 Delta Air Lines 4 2026-04-29
DAL2205 Delta Air Lines 4 2026-07-18
DAL2089 - 4 2026-07-06
DAL2022 Delta Air Lines 4 2026-06-15
DAL1663 Delta Air Lines 4 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1097 BOS → RSW Jul 26, 21:40 UTCJul 26, 22:15 UTC35m
2026-07-26 DAL1273 LAS → LAX Jul 26, 19:20 UTCJul 26, 19:45 UTC25m
2026-07-26 DAL1273 LAS → LAX Jul 26, 17:25 UTCJul 26, 17:55 UTC30m
2026-07-26 DAL1571 JFK → LAX Jul 26, 14:38 UTCJul 26, 15:48 UTC1h 10m
2026-07-26 DAL1571 JFK → LAX Jul 26, 12:15 UTCJul 26, 13:30 UTC1h 15m
2026-07-26 DAL3055 CHS → ATL Jul 26, 09:20 UTCJul 26, 10:05 UTC45m
2026-07-26 DAL3055 CHS → ATL Jul 26, 09:17 UTCJul 26, 10:02 UTC45m
2026-07-26 DAL2850 SJC → ATL Jul 26, 03:00 UTCJul 26, 03:45 UTC45m
2026-07-25 DAL787 ATL → BOS Jul 25, 20:10 UTCJul 25, 23:50 UTC3h 40m
2026-07-25 DAL787 ATL → BOS Jul 25, 14:10 UTCJul 25, 18:25 UTC4h 15m
2026-07-25 DAL2933 BOS → RDU Jul 25, 10:10 UTCJul 25, 12:05 UTC1h 55m
2026-07-25 DAL1011 ATL → BDL Jul 25, 02:15 UTCJul 25, 04:10 UTC1h 55m
2026-07-25 DAL1011 ATL → BDL Jul 25, 02:13 UTCJul 25, 04:05 UTC1h 52m
2026-07-24 DAL2739 ATL → BDL Jul 24, 22:50 UTCJul 25, 00:45 UTC1h 55m
2026-07-24 DAL2739 ATL → BDL Jul 24, 18:30 UTCJul 24, 20:25 UTC1h 55m
2026-07-24 DAL886 CVG → SEA Jul 24, 13:10 UTCJul 24, 16:25 UTC3h 15m
2026-07-24 DAL1251 ATL → TUS Jul 24, 02:00 UTCJul 24, 05:05 UTC3h 5m
2026-07-24 DAL1251 ATL → TUS Jul 24, 02:00 UTCJul 24, 05:09 UTC3h 9m
2026-07-23 DAL787 ATL → BOS Jul 23, 20:00 UTCJul 23, 23:50 UTC3h 50m
2026-07-23 DAL787 ATL → BOS Jul 23, 14:15 UTCJul 23, 18:15 UTC4h 0m
2026-07-23 DAL1445 - Jul 23, 11:10 UTCJul 23, 12:25 UTC1h 15m
2026-07-23 DAL1445 SRQ → ATL Jul 23, 11:08 UTCJul 23, 12:22 UTC1h 14m
2026-07-23 DAL2997 ATL → SRQ Jul 23, 03:25 UTCJul 23, 04:30 UTC1h 5m
2026-07-23 DAL3115 SRQ → ATL Jul 23, 00:15 UTCJul 23, 01:30 UTC1h 15m
2026-07-22 DAL3115 SRQ → ATL Jul 22, 21:50 UTCJul 22, 23:00 UTC1h 10m
2026-07-22 DAL2908 ATL → MCI Jul 22, 17:30 UTCJul 22, 19:00 UTC1h 30m
2026-07-22 DAL2908 ATL → MCI Jul 22, 14:25 UTCJul 22, 16:00 UTC1h 35m
2026-07-22 DAL2838 RDU → LGA Jul 22, 11:15 UTCJul 22, 12:30 UTC1h 15m
2026-07-21 DAL1339 ATL → CLE Jul 21, 22:10 UTCJul 21, 23:50 UTC1h 40m
2026-07-21 DAL1339 ATL → CLE Jul 21, 22:07 UTCJul 21, 23:45 UTC1h 38m
2026-07-21 DAL2894 ATL → PHL Jul 21, 19:05 UTCJul 21, 20:20 UTC1h 15m
2026-07-21 DAL2894 ATL → PHL Jul 21, 19:00 UTCJul 21, 20:20 UTC1h 20m
2026-07-21 DAL2894 ATL → PHL Jul 21, 15:30 UTCJul 21, 17:25 UTC1h 55m
2026-07-21 DAL1039 MSP → ATL Jul 21, 12:20 UTCJul 21, 14:10 UTC1h 50m
2026-07-19 DAL1701 ORD → ATL Jul 19, 20:30 UTCJul 19, 23:20 UTC2h 50m
2026-07-19 DAL1701 ORD → ATL Jul 19, 20:26 UTCJul 19, 23:16 UTC2h 50m
2026-07-19 DAL1701 ORD → ATL Jul 19, 15:35 UTCJul 19, 18:50 UTC3h 15m
2026-07-19 DAL1678 - Jul 19, 03:00 UTCJul 19, 13:45 UTC10h 45m
2026-07-18 DAL2205 MCO → ATL Jul 18, 22:35 UTCJul 19, 01:25 UTC2h 50m
2026-07-18 DAL2205 MCO → ATL Jul 18, 22:35 UTCJul 19, 01:27 UTC2h 52m
2026-07-18 DAL768 - Jul 18, 13:10 UTCJul 18, 16:50 UTC3h 40m
2026-07-18 DAL768 LAX → BNA Jul 18, 13:07 UTCJul 18, 16:50 UTC3h 43m
2026-07-18 DAL769 - Jul 18, 00:35 UTCJul 18, 04:30 UTC3h 56m
2026-07-17 DAL2205 SLC → BNA Jul 17, 19:55 UTCJul 17, 23:00 UTC3h 5m
2026-07-17 DAL2205 SLC → BNA Jul 17, 19:53 UTCJul 17, 22:59 UTC3h 6m
2026-07-17 DAL1203 PDX → SLC Jul 17, 16:59 UTCJul 17, 18:34 UTC1h 35m
2026-07-17 DAL1203 PDX → SLC Jul 17, 16:59 UTCJul 17, 18:34 UTC1h 35m
2026-07-17 DAL1203 - Jul 17, 14:00 UTCJul 17, 15:20 UTC1h 20m
2026-07-17 DAL2954 MSP → SLC Jul 17, 03:50 UTCJul 17, 12:19 UTC8h 30m
2026-07-16 DAL2159 - Jul 16, 22:55 UTCJul 17, 02:10 UTC3h 15m

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 N933DZ page for operator, model, and routing details .

Mode-S ACF131 frequently asked

What is Mode-S code ACF131?
ACF131 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N933DZ.
Where is Mode-S ACF131 registered?
Mode-S code ACF131 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 ACF131 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF131, octal 53170461, decimal 11,333,937.
What flights does ACF131 operate?
Mode-S ACF131 has broadcast 20 distinct callsigns, including DAL728, DAL2058, DAL637, DAL481, DAL3104.