Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABBDFA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N856DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
ABBDFA
Octal
52736772
Decimal
11,255,290
Country
US
Tail
N856DN
Type
B739
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
488
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S ABBDFA.

Country allocation

The ICAO 24-bit address ABBDFA 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
DAL2500 - 10 2026-07-17
DAL1879 Delta Air Lines 8 2026-07-24
DAL2042 - 7 2026-07-17
DAL2022 Delta Air Lines 7 2026-07-07
DAL1002 Delta Air Lines 7 2026-07-21
DAL2253 Delta Air Lines 6 2026-05-14
DAL937 Delta Air Lines 5 2026-06-18
DAL3109 - 5 2026-07-13
DAL2532 - 5 2026-06-30
DAL2323 Delta Air Lines 5 2026-06-05
DAL1861 Delta Air Lines 5 2026-07-24
DAL1528 - 5 2026-06-27
DAL1419 Delta Air Lines 5 2026-05-21
DAL1178 Delta Air Lines 5 2026-06-24
DAL1004 - 5 2026-07-19
DAL874 Delta Air Lines 4 2026-05-24
DAL682 - 4 2026-07-03
DAL592 - 4 2026-07-22
DAL542 Delta Air Lines 4 2026-04-18
DAL539 Delta Air Lines 4 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL629 ATL → BOS Jul 26, 16:55 UTCJul 26, 21:35 UTC4h 40m
2026-07-26 DAL1523 SLC → SJC Jul 26, 14:15 UTCJul 26, 15:10 UTC55m
2026-07-26 DAL1523 SLC → SJC Jul 26, 11:35 UTCJul 26, 12:35 UTC1h 0m
2026-07-25 DAL1871 SJD → SLC Jul 25, 20:58 UTCJul 26, 01:34 UTC4h 36m
2026-07-25 DAL1871 SJD → SLC Jul 25, 21:00 UTCJul 26, 01:35 UTC4h 35m
2026-07-25 DAL2470 LGA → MSY Jul 25, 14:30 UTCJul 25, 19:20 UTC4h 50m
2026-07-25 DAL2453 LGA → DTW Jul 25, 10:55 UTCJul 25, 12:25 UTC1h 30m
2026-07-25 DAL2210 LGA → IAH Jul 25, 01:05 UTCJul 25, 02:30 UTC1h 25m
2026-07-24 DAL1800 MBJ → ATL Jul 24, 19:48 UTCJul 24, 22:21 UTC2h 33m
2026-07-24 DAL1801 ATL → MBJ Jul 24, 15:45 UTCJul 24, 22:15 UTC6h 30m
2026-07-24 DAL1879 MSP → ORD Jul 24, 12:00 UTCJul 24, 13:40 UTC1h 40m
2026-07-24 DAL1879 MSP → ORD Jul 24, 10:20 UTCJul 24, 10:35 UTC15m
2026-07-24 DAL1879 MSP → ORD Jul 24, 10:18 UTCJul 24, 13:36 UTC3h 18m
2026-07-24 DAL1861 ATL → SJU Jul 24, 02:15 UTCJul 24, 02:35 UTC20m
2026-07-23 DAL1861 ATL → SJU Jul 23, 23:25 UTCJul 24, 00:40 UTC1h 15m
2026-07-23 DAL1997 ATL → MBJ Jul 23, 14:30 UTCJul 23, 21:05 UTC6h 35m
2026-07-23 DAL3058 ATL → DAY Jul 23, 11:20 UTCJul 23, 12:25 UTC1h 5m
2026-07-23 DAL3082 ATL → LEX Jul 23, 01:00 UTCJul 23, 01:45 UTC45m
2026-07-22 DAL1962 CUN → ATL Jul 22, 20:55 UTCJul 22, 22:55 UTC2h 0m
2026-07-22 DAL592 ATL → CUN Jul 22, 17:10 UTCJul 22, 19:10 UTC2h 0m
2026-07-22 DAL1688 ABQ → ATL Jul 22, 13:05 UTCJul 22, 15:40 UTC2h 35m
2026-07-22 DAL1531 IAH → LGA Jul 22, 01:00 UTCJul 22, 03:45 UTC2h 45m
2026-07-21 DAL1002 ATL → ELP Jul 21, 21:05 UTCJul 21, 23:35 UTC2h 30m
2026-07-21 DAL1002 ATL → ELP Jul 21, 16:55 UTCJul 21, 19:15 UTC2h 20m
2026-07-21 DAL2227 JFK → ATL Jul 21, 13:30 UTCJul 21, 15:25 UTC1h 55m
2026-07-21 DAL2611 BOS → JFK Jul 21, 10:35 UTCJul 21, 11:20 UTC45m
2026-07-21 DAL2639 EWR → ATL Jul 21, 01:55 UTCJul 21, 02:40 UTC45m
2026-07-20 DAL2378 SMF → SEA Jul 20, 21:20 UTCJul 20, 23:10 UTC1h 50m
2026-07-20 DAL2378 SMF → SEA Jul 20, 21:17 UTCJul 20, 23:04 UTC1h 47m
2026-07-20 DAL1359 PBI → LGA Jul 20, 18:40 UTCJul 20, 19:20 UTC40m
2026-07-20 DAL1359 PBI → LGA Jul 20, 18:38 UTCJul 20, 19:21 UTC43m
2026-07-20 DAL1359 PBI → LGA Jul 20, 16:50 UTCJul 20, 17:25 UTC35m
2026-07-20 DAL1445 - Jul 20, 14:15 UTCJul 20, 15:20 UTC1h 5m
2026-07-20 DAL1445 SRQ → ATL Jul 20, 14:13 UTCJul 20, 15:20 UTC1h 7m
2026-07-20 DAL2997 ATL → SRQ Jul 20, 04:40 UTCJul 20, 05:45 UTC1h 5m
2026-07-20 DAL1346 DTW → MIA Jul 20, 01:30 UTCJul 20, 02:45 UTC1h 15m
2026-07-20 DAL1346 DTW → MIA Jul 20, 01:30 UTCJul 20, 02:50 UTC1h 20m
2026-07-19 DAL1346 DTW → MIA Jul 19, 22:20 UTCJul 19, 23:40 UTC1h 20m
2026-07-19 DAL1004 - Jul 19, 17:50 UTCJul 19, 20:50 UTC3h 0m
2026-07-19 DAL1004 ABQ → ATL Jul 19, 17:48 UTCJul 19, 20:52 UTC3h 4m
2026-07-19 DAL1004 ATL → ABQ Jul 19, 13:15 UTCJul 19, 15:55 UTC2h 40m
2026-07-18 DAL1480 ATL → BOS Jul 18, 22:46 UTCJul 19, 00:47 UTC2h 1m
2026-07-18 DAL1480 ATL → BOS Jul 18, 22:50 UTCJul 19, 00:50 UTC2h 0m
2026-07-18 DAL1520 DTW → ORD Jul 18, 16:10 UTCJul 18, 18:35 UTC2h 25m
2026-07-18 DAL2347 RDU → BOS Jul 18, 11:55 UTCJul 18, 14:42 UTC2h 47m
2026-07-18 DAL2347 RDU → BOS Jul 18, 11:55 UTCJul 18, 14:45 UTC2h 50m
2026-07-18 DAL2300 BDL → DTW Jul 18, 02:29 UTCJul 18, 04:50 UTC2h 21m
2026-07-17 DAL2300 LGA → MIA Jul 17, 19:49 UTCJul 17, 22:15 UTC2h 25m
2026-07-17 DAL770 TPA → LGA Jul 17, 15:20 UTCJul 17, 17:40 UTC2h 20m
2026-07-17 DAL2042 JFK → TPA Jul 17, 11:10 UTCJul 17, 13:20 UTC2h 10m

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 N856DN page for operator, model, and routing details .

Mode-S ABBDFA frequently asked

What is Mode-S code ABBDFA?
ABBDFA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N856DN.
Where is Mode-S ABBDFA registered?
Mode-S code ABBDFA 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 ABBDFA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBDFA, octal 52736772, decimal 11,255,290.
What flights does ABBDFA operate?
Mode-S ABBDFA has broadcast 20 distinct callsigns, including DAL2500, DAL1879, DAL2042, DAL2022, DAL1002.