Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACB4C1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N918DU · BOEING 737-900 · operated by DELTA AIR LINES INC, DEPT 595 AIRCRAFT REGISTRATIONS

Hex
ACB4C1
Octal
53132301
Decimal
11,318,465
Country
US
Tail
N918DU
Type
B739
No current signal · last broadcast 5h ago
Flights observed
477
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S ACB4C1.

Country allocation

The ICAO 24-bit address ACB4C1 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
DAL902 - 6 2026-07-06
DAL2872 - 6 2026-07-08
DAL868 - 5 2026-07-08
DAL574 - 5 2026-07-09
DAL402 - 5 2026-07-09
DAL2449 Delta Air Lines 5 2026-04-28
DAL1013 Delta Air Lines 5 2026-05-25
DAL1004 Delta Air Lines 5 2026-05-31
DAL967 Delta Air Lines 4 2026-04-20
DAL941 - 4 2026-07-08
DAL481 - 4 2026-06-29
DAL2658 Delta Air Lines 4 2026-05-07
DAL2454 - 4 2026-07-14
DAL2312 Delta Air Lines 4 2026-05-12
DAL2093 - 4 2026-07-14
DAL2058 Delta Air Lines 4 2026-05-27
DAL1599 - 4 2026-07-10
DAL1468 - 4 2026-06-16
DAL1129 - 4 2026-07-12
DAL866 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2454 TPA → LGA Jul 14, 23:00 UTCJul 15, 01:25 UTC2h 25m
2026-07-14 DAL2093 JFK → TPA Jul 14, 18:50 UTCJul 14, 21:00 UTC2h 10m
2026-07-14 DAL2380 ATL → JFK Jul 14, 15:15 UTCJul 14, 17:05 UTC1h 50m
2026-07-14 DAL2380 ATL → JFK Jul 14, 15:15 UTCJul 14, 17:05 UTC1h 50m
2026-07-14 DAL3165 - Jul 14, 12:20 UTCJul 14, 13:25 UTC1h 5m
2026-07-14 DAL1501 ATL → CMH Jul 14, 03:10 UTCJul 14, 04:20 UTC1h 10m
2026-07-14 DAL1501 ATL → CMH Jul 14, 03:11 UTCJul 14, 04:16 UTC1h 5m
2026-07-14 DAL3115 - Jul 14, 00:15 UTCJul 14, 01:25 UTC1h 10m
2026-07-13 DAL3115 ATL → SRQ Jul 13, 21:50 UTCJul 13, 23:05 UTC1h 15m
2026-07-13 DAL566 STL → ATL Jul 13, 18:30 UTCJul 13, 20:10 UTC1h 40m
2026-07-13 DAL566 ATL → STL Jul 13, 15:55 UTCJul 13, 17:05 UTC1h 10m
2026-07-13 DAL1039 MSP → ATL Jul 13, 12:15 UTCJul 13, 14:15 UTC2h 0m
2026-07-12 DAL1129 DEN → MSP Jul 12, 12:15 UTCJul 12, 13:50 UTC1h 35m
2026-07-11 DAL2931 MSP → DEN Jul 11, 23:45 UTCJul 12, 01:10 UTC1h 25m
2026-07-11 DAL1766 - Jul 11, 19:20 UTCJul 11, 21:50 UTC2h 30m
2026-07-11 DAL1766 - Jul 11, 15:10 UTCJul 11, 17:25 UTC2h 15m
2026-07-11 DAL1129 DEN → MSP Jul 11, 12:10 UTCJul 11, 13:40 UTC1h 30m
2026-07-11 DAL1129 DEN → MSP Jul 11, 12:10 UTCJul 11, 13:43 UTC1h 33m
2026-07-11 DAL2931 MSP → DEN Jul 11, 01:20 UTCJul 11, 02:55 UTC1h 35m
2026-07-10 DAL2129 - Jul 10, 18:55 UTCJul 10, 22:20 UTC3h 25m
2026-07-10 DAL2129 MSP → MIA Jul 10, 14:05 UTCJul 10, 17:20 UTC3h 15m
2026-07-10 DAL1274 MSN → MSP Jul 10, 11:05 UTCJul 10, 11:50 UTC45m
2026-07-10 DAL1599 - Jul 10, 03:15 UTCJul 10, 04:00 UTC45m
2026-07-10 DAL1599 MSP → MSN Jul 10, 03:15 UTCJul 10, 03:52 UTC37m
2026-07-09 DAL402 RSW → MSP Jul 9, 22:20 UTCJul 10, 01:30 UTC3h 10m
2026-07-09 DAL402 MSP → RSW Jul 9, 18:00 UTCJul 9, 21:10 UTC3h 10m
2026-07-09 DAL2229 SMF → MSP Jul 9, 13:25 UTCJul 9, 16:20 UTC2h 55m
2026-07-09 DAL574 MSP → SMF Jul 9, 00:00 UTCJul 9, 03:35 UTC3h 35m
2026-07-08 DAL941 SEA → MSP Jul 8, 19:40 UTCJul 8, 22:30 UTC2h 50m
2026-07-08 DAL868 MSP → SEA Jul 8, 14:25 UTCJul 8, 17:40 UTC3h 15m
2026-07-08 DAL2872 BWI → MSP Jul 8, 10:35 UTCJul 8, 12:45 UTC2h 10m
2026-07-08 DAL2872 BWI → MSP Jul 8, 10:35 UTCJul 8, 12:41 UTC2h 6m
2026-07-08 DAL2918 MSP → BWI Jul 8, 01:10 UTCJul 8, 03:10 UTC2h 0m
2026-07-07 DAL2843 - Jul 7, 21:20 UTCJul 7, 23:05 UTC1h 45m
2026-07-07 DAL2843 MSP → BNA Jul 7, 17:55 UTCJul 7, 19:35 UTC1h 40m
2026-07-07 DAL2916 SLC → MSP Jul 7, 14:20 UTCJul 7, 16:20 UTC2h 0m
2026-07-07 DAL491 - Jul 7, 11:40 UTCJul 7, 12:10 UTC30m
2026-07-07 DAL491 BZN → SLC Jul 7, 11:17 UTCJul 7, 12:10 UTC53m
2026-07-07 DAL2046 - Jul 7, 05:10 UTCJul 7, 05:35 UTC25m
2026-07-07 DAL2046 SLC → BZN Jul 7, 05:08 UTCJul 7, 06:06 UTC58m
2026-07-07 DAL1451 PHX → SLC Jul 7, 02:20 UTCJul 7, 03:30 UTC1h 10m
2026-07-07 DAL1451 PHX → SLC Jul 7, 02:18 UTCJul 7, 03:25 UTC1h 7m
2026-07-06 DAL1451 SLC → PHX Jul 6, 23:35 UTCJul 7, 01:00 UTC1h 25m
2026-07-06 DAL902 OAK → SLC Jul 6, 20:40 UTCJul 6, 22:10 UTC1h 30m
2026-07-06 DAL902 SFO → SLC Jul 6, 20:37 UTCJul 6, 22:04 UTC1h 27m
2026-07-06 DAL902 SLC → SFO Jul 6, 17:30 UTCJul 6, 19:15 UTC1h 45m
2026-07-06 DAL1176 BWI → SLC Jul 6, 11:25 UTCJul 6, 15:20 UTC3h 55m
2026-07-06 DAL2079 SLC → BWI Jul 6, 06:00 UTCJul 6, 09:45 UTC3h 45m
2026-07-06 DAL2652 - Jul 6, 02:45 UTCJul 6, 04:05 UTC1h 20m
2026-07-05 DAL442 - Jul 5, 20:35 UTCJul 6, 00:55 UTC4h 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 N918DU page for operator, model, and routing details .

Mode-S ACB4C1 frequently asked

What is Mode-S code ACB4C1?
ACB4C1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N918DU.
Where is Mode-S ACB4C1 registered?
Mode-S code ACB4C1 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 ACB4C1 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACB4C1, octal 53132301, decimal 11,318,465.
What flights does ACB4C1 operate?
Mode-S ACB4C1 has broadcast 20 distinct callsigns, including DAL902, DAL2872, DAL868, DAL574, DAL402.