Apparatus

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sensors Mode-S transponder

AB879F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N842DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AB879F
Octal
52703637
Decimal
11,241,375
Country
US
Tail
N842DN
Type
B739
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
478
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S AB879F.

Country allocation

The ICAO 24-bit address AB879F 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
DAL3115 - 9 2026-06-30
DAL2323 Delta Air Lines 8 2026-07-23
DAL305 Delta Air Lines 7 2026-07-22
DAL2843 - 5 2026-07-05
DAL2739 Delta Air Lines 5 2026-06-06
DAL2165 Delta Air Lines 5 2026-07-23
DAL2042 Delta Air Lines 5 2026-06-15
DAL1029 Delta Air Lines 5 2026-07-24
DAL858 - 4 2026-07-10
DAL2400 Delta Air Lines 4 2026-05-29
DAL2136 Delta Air Lines 4 2026-06-12
DAL2020 Delta Air Lines 4 2026-05-01
DAL1699 - 4 2026-06-22
DAL1428 Delta Air Lines 4 2026-06-04
DAL1414 Delta Air Lines 4 2026-07-23
DAL868 - 3 2026-07-06
DAL766 Delta Air Lines 3 2026-04-16
DAL672 Delta Air Lines 3 2026-05-24
DAL562 Delta Air Lines 3 2026-04-17
DAL462 Delta Air Lines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL3109 ATL → SRQ Jul 26, 19:55 UTCJul 26, 21:05 UTC1h 10m
2026-07-26 DAL662 BNA → LGA Jul 26, 13:55 UTCJul 26, 18:05 UTC4h 10m
2026-07-25 DAL2008 MSP → LAX Jul 25, 21:25 UTCJul 26, 00:50 UTC3h 25m
2026-07-25 DAL2924 SLC → OAK Jul 25, 17:35 UTCJul 25, 19:40 UTC2h 5m
2026-07-25 DAL2924 SLC → OAK Jul 25, 17:31 UTCJul 25, 19:35 UTC2h 4m
2026-07-25 DAL2023 ATL → PVD Jul 25, 11:40 UTCJul 25, 16:00 UTC4h 20m
2026-07-25 DAL2075 PHL → ATL Jul 25, 06:20 UTCJul 25, 10:00 UTC3h 40m
2026-07-25 DAL1165 LGA → MCO Jul 25, 03:25 UTCJul 25, 04:55 UTC1h 30m
2026-07-24 DAL481 SEA → OGG Jul 24, 20:40 UTCJul 25, 01:30 UTC4h 50m
2026-07-24 DAL1029 DAY → ATL Jul 24, 15:20 UTCJul 24, 17:05 UTC1h 45m
2026-07-23 DAL2323 BOS → JAX Jul 23, 21:25 UTCJul 24, 00:55 UTC3h 30m
2026-07-23 DAL2323 BOS → JAX Jul 23, 16:00 UTCJul 23, 19:20 UTC3h 20m
2026-07-23 DAL2165 MIA → BOS Jul 23, 11:25 UTCJul 23, 13:40 UTC2h 15m
2026-07-23 DAL1414 ATL → BDL Jul 23, 00:34 UTCJul 23, 03:06 UTC2h 32m
2026-07-23 DAL1414 ATL → BDL Jul 23, 00:35 UTCJul 23, 03:10 UTC2h 35m
2026-07-22 DAL305 HNL → JFK Jul 22, 20:15 UTCJul 22, 22:40 UTC2h 25m
2026-07-22 DAL305 HNL → JFK Jul 22, 16:20 UTCJul 22, 18:55 UTC2h 35m
2026-07-22 DAL2428 MIA → JFK Jul 22, 11:20 UTCJul 22, 13:45 UTC2h 25m
2026-07-21 DAL1538 - Jul 21, 16:25 UTCJul 21, 19:25 UTC3h 0m
2026-07-21 DAL2532 - Jul 21, 11:40 UTCJul 21, 13:55 UTC2h 15m
2026-07-21 DAL2410 - Jul 21, 01:05 UTCJul 21, 03:20 UTC2h 15m
2026-07-21 DAL2410 - Jul 21, 01:02 UTCJul 21, 03:18 UTC2h 16m
2026-07-20 DAL1538 - Jul 20, 20:35 UTCJul 20, 23:20 UTC2h 45m
2026-07-20 DAL1538 LGA → MIA Jul 20, 15:55 UTCJul 20, 18:25 UTC2h 30m
2026-07-20 DAL2532 - Jul 20, 11:40 UTCJul 20, 14:00 UTC2h 20m
2026-07-20 DAL2532 - Jul 20, 11:38 UTCJul 20, 13:57 UTC2h 19m
2026-07-20 DAL2410 - Jul 20, 00:10 UTCJul 20, 02:40 UTC2h 30m
2026-07-18 DAL2723 - Jul 18, 15:05 UTCJul 18, 15:20 UTC15m
2026-07-18 DAL2723 - Jul 18, 13:05 UTCJul 18, 15:00 UTC1h 55m
2026-07-18 DAL1355 - Jul 18, 00:10 UTCJul 18, 02:19 UTC2h 10m
2026-07-18 DAL1355 DTW → TPA Jul 18, 00:06 UTCJul 18, 02:14 UTC2h 8m
2026-07-17 DAL618 CUN → DTW Jul 17, 18:00 UTCJul 17, 21:16 UTC3h 16m
2026-07-17 DAL618 CUN → DTW Jul 17, 18:00 UTCJul 17, 21:15 UTC3h 15m
2026-07-17 DAL619 - Jul 17, 13:25 UTCJul 17, 16:29 UTC3h 5m
2026-07-16 DAL361 - Jul 16, 19:05 UTCJul 16, 23:05 UTC4h 0m
2026-07-16 DAL361 - Jul 16, 13:05 UTCJul 16, 17:20 UTC4h 15m
2026-07-15 DAL533 SEA → DTW Jul 15, 21:55 UTCJul 16, 01:50 UTC3h 55m
2026-07-15 DAL1656 - Jul 15, 16:35 UTCJul 15, 19:40 UTC3h 5m
2026-07-15 DAL931 SEA → ANC Jul 15, 00:40 UTCJul 15, 03:45 UTC3h 5m
2026-07-14 DAL2905 LAS → SEA Jul 14, 20:45 UTCJul 14, 22:35 UTC1h 50m
2026-07-14 DAL2905 SEA → LAS Jul 14, 17:10 UTCJul 14, 19:20 UTC2h 10m
2026-07-14 DAL1418 MSP → SEA Jul 14, 12:00 UTCJul 14, 15:20 UTC3h 20m
2026-07-14 DAL2284 PHX → MSP Jul 14, 00:15 UTCJul 14, 03:00 UTC2h 45m
2026-07-13 DAL2284 - Jul 13, 20:10 UTCJul 13, 22:45 UTC2h 35m
2026-07-13 DAL1766 - Jul 13, 16:00 UTCJul 13, 18:25 UTC2h 25m
2026-07-13 DAL1766 - Jul 13, 12:15 UTCJul 13, 14:30 UTC2h 15m
2026-07-13 DAL1173 SLC → MSP Jul 13, 03:10 UTCJul 13, 05:20 UTC2h 10m
2026-07-13 DAL2311 - Jul 13, 00:30 UTCJul 13, 01:50 UTC1h 20m
2026-07-12 DAL908 - Jul 12, 19:20 UTCJul 12, 23:15 UTC3h 55m
2026-07-12 DAL908 DTW → LAX Jul 12, 19:18 UTCJul 12, 23:10 UTC3h 52m

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 N842DN page for operator, model, and routing details .

Mode-S AB879F frequently asked

What is Mode-S code AB879F?
AB879F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N842DN.
Where is Mode-S AB879F registered?
Mode-S code AB879F 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 AB879F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB879F, octal 52703637, decimal 11,241,375.
What flights does AB879F operate?
Mode-S AB879F has broadcast 20 distinct callsigns, including DAL3115, DAL2323, DAL305, DAL2843, DAL2739.