Apparatus

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sensors Mode-S transponder

A4000F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N357NW · AIRBUS A-320 · operated by DELTA AIR LINES INC

Hex
A4000F
Octal
51000017
Decimal
10,747,919
Country
US
Tail
N357NW
Type
A320
Broadcasting now · callsign DAL2873 · 37,000 ft
Flights observed
485
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A4000F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4000F 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
DAL2479 - 19 2026-07-08
DAL1996 - 12 2026-07-03
DAL1509 - 12 2026-06-28
DAL410 - 10 2026-06-26
DAL1728 - 10 2026-06-26
DAL850 Delta Air Lines 9 2026-06-11
DAL832 - 9 2026-07-09
DAL2557 - 9 2026-07-04
DAL2333 Delta Air Lines 9 2026-04-21
DAL1676 Delta Air Lines 9 2026-06-24
DAL1285 Delta Air Lines 9 2026-06-15
DAL1145 Delta Air Lines 8 2026-04-22
DAL1121 Delta Air Lines 8 2026-07-09
DAL1053 - 8 2026-07-11
DAL2266 Delta Air Lines 7 2026-05-30
DAL1959 - 7 2026-06-27
DAL1076 - 7 2026-06-15
DAL380 Delta Air Lines 6 2026-06-08
DAL2537 Delta Air Lines 6 2026-07-03
DAL2422 Delta Air Lines 6 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2811 SLC → DFW Jul 14, 20:10 UTCJul 14, 22:25 UTC2h 15m
2026-07-14 DAL920 SFO → SLC Jul 14, 17:30 UTCJul 14, 18:50 UTC1h 20m
2026-07-14 DAL920 SFO → SLC Jul 14, 17:26 UTCJul 14, 18:46 UTC1h 20m
2026-07-14 DAL920 SLC → SFO Jul 14, 14:40 UTCJul 14, 16:20 UTC1h 40m
2026-07-14 DAL1360 - Jul 14, 11:25 UTCJul 14, 12:20 UTC55m
2026-07-14 DAL1340 - Jul 14, 05:00 UTCJul 14, 05:55 UTC55m
2026-07-14 DAL1340 SLC → BIL Jul 14, 05:01 UTCJul 14, 05:56 UTC55m
2026-07-14 DAL2812 DFW → SLC Jul 14, 01:40 UTCJul 14, 03:55 UTC2h 15m
2026-07-13 DAL2971 MSP → DFW Jul 13, 20:55 UTCJul 13, 22:55 UTC2h 0m
2026-07-13 DAL2017 - Jul 13, 17:00 UTCJul 13, 19:20 UTC2h 20m
2026-07-13 DAL1744 - Jul 13, 15:00 UTCJul 13, 15:45 UTC45m
2026-07-12 DAL2882 - Jul 12, 20:05 UTCJul 12, 22:10 UTC2h 5m
2026-07-12 DAL2882 MCI → SLC Jul 12, 20:04 UTCJul 12, 22:02 UTC1h 58m
2026-07-12 DAL2882 - Jul 12, 16:45 UTCJul 12, 18:45 UTC2h 0m
2026-07-12 DAL1291 DFW → SLC Jul 12, 12:55 UTCJul 12, 15:05 UTC2h 10m
2026-07-12 DAL818 ATL → DFW Jul 12, 04:50 UTCJul 12, 06:40 UTC1h 50m
2026-07-12 DAL1206 - Jul 12, 00:10 UTCJul 12, 01:45 UTC1h 35m
2026-07-11 DAL1206 - Jul 11, 21:35 UTCJul 11, 23:05 UTC1h 30m
2026-07-11 DAL1125 - Jul 11, 17:10 UTCJul 11, 19:30 UTC2h 20m
2026-07-11 DAL1125 OMA → ATL Jul 11, 17:08 UTCJul 11, 19:25 UTC2h 17m
2026-07-11 DAL1125 - Jul 11, 14:00 UTCJul 11, 15:50 UTC1h 50m
2026-07-11 DAL1053 - Jul 11, 02:45 UTCJul 11, 03:45 UTC1h 0m
2026-07-11 DAL1053 ALB → ATL Jul 11, 02:41 UTCJul 11, 04:40 UTC1h 59m
2026-07-10 DAL1053 ATL → ALB Jul 10, 23:35 UTCJul 11, 01:30 UTC1h 55m
2026-07-10 DAL2991 - Jul 10, 20:15 UTCJul 10, 22:25 UTC2h 10m
2026-07-10 DAL2991 - Jul 10, 17:00 UTCJul 10, 18:45 UTC1h 45m
2026-07-10 DAL1350 CLE → ATL Jul 10, 01:05 UTCJul 10, 02:15 UTC1h 10m
2026-07-09 DAL1350 ATL → CLE Jul 9, 22:15 UTCJul 9, 23:50 UTC1h 35m
2026-07-09 DAL1121 ATL → ATW Jul 9, 18:00 UTCJul 9, 20:15 UTC2h 15m
2026-07-09 DAL1121 ATL → ATW Jul 9, 17:55 UTCJul 9, 20:13 UTC2h 18m
2026-07-09 DAL1121 ATL → ATW Jul 9, 14:40 UTCJul 9, 16:30 UTC1h 50m
2026-07-09 DAL1073 - Jul 9, 11:05 UTCJul 9, 12:55 UTC1h 50m
2026-07-09 DAL1508 - Jul 9, 04:25 UTCJul 9, 06:20 UTC1h 55m
2026-07-09 DAL832 - Jul 9, 01:35 UTCJul 9, 02:50 UTC1h 15m
2026-07-08 DAL832 ATL → DCA Jul 8, 23:15 UTCJul 9, 00:35 UTC1h 20m
2026-07-08 DAL2479 - Jul 8, 18:25 UTCJul 8, 20:30 UTC2h 5m
2026-07-08 DAL2479 - Jul 8, 14:30 UTCJul 8, 16:40 UTC2h 10m
2026-07-08 DAL1073 - Jul 8, 11:00 UTCJul 8, 12:55 UTC1h 55m
2026-07-07 DAL2893 - Jul 7, 23:20 UTCJul 8, 01:20 UTC2h 0m
2026-07-07 DAL2893 ATL → SAT Jul 7, 23:19 UTCJul 8, 01:21 UTC2h 2m
2026-07-07 DAL2479 - Jul 7, 18:20 UTCJul 7, 20:45 UTC2h 25m
2026-07-07 DAL2479 - Jul 7, 14:50 UTCJul 7, 16:50 UTC2h 0m
2026-07-07 DAL343 DCA → ATL Jul 7, 12:10 UTCJul 7, 13:25 UTC1h 15m
2026-07-06 DAL325 ATL → DCA Jul 6, 23:45 UTCJul 7, 01:05 UTC1h 20m
2026-07-06 DAL1576 BGR → ATL Jul 6, 19:00 UTCJul 6, 21:35 UTC2h 35m
2026-07-06 DAL1576 ATL → BGR Jul 6, 14:55 UTCJul 6, 17:15 UTC2h 20m
2026-07-06 DAL343 DCA → ATL Jul 6, 12:22 UTCJul 6, 13:40 UTC1h 18m
2026-07-06 DAL343 DCA → ATL Jul 6, 12:25 UTCJul 6, 13:45 UTC1h 20m
2026-07-06 DAL727 ATL → DCA Jul 6, 01:20 UTCJul 6, 02:40 UTC1h 20m
2026-07-05 DAL2991 - Jul 5, 20:00 UTCJul 5, 21:45 UTC1h 45m

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 N357NW page for operator, model, and routing details .

Mode-S A4000F frequently asked

What is Mode-S code A4000F?
A4000F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N357NW.
Where is Mode-S A4000F registered?
Mode-S code A4000F 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 A4000F broadcasting right now?
Yes. Mode-S A4000F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4000F, octal 51000017, decimal 10,747,919.
What flights does A4000F operate?
Mode-S A4000F has broadcast 20 distinct callsigns, including DAL2479, DAL1996, DAL1509, DAL410, DAL1728.