Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABC1BC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N857DZ · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
ABC1BC
Octal
52740674
Decimal
11,256,252
Country
US
Tail
N857DZ
Type
B739
No current signal · last broadcast 14h ago
Flights observed
461
Distinct callsigns
20
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S ABC1BC.

Country allocation

The ICAO 24-bit address ABC1BC 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
DAL1907 Delta Air Lines 9 2026-07-08
DAL1918 - 8 2026-07-08
DAL2397 Delta Air Lines 7 2026-04-25
DAL1411 - 7 2026-07-07
DAL809 Delta Air Lines 6 2026-04-17
DAL1730 Delta Air Lines 6 2026-06-09
DAL2999 Delta Air Lines 5 2026-07-09
DAL2280 Delta Air Lines 5 2026-05-27
DAL1663 - 5 2026-06-24
DAL1496 Delta Air Lines 5 2026-06-04
DAL1004 - 5 2026-07-03
DAL637 Delta Air Lines 4 2026-05-18
DAL2916 Delta Air Lines 4 2026-06-13
DAL2700 Delta Air Lines 4 2026-06-19
DAL2651 Delta Air Lines 4 2026-05-26
DAL2500 Delta Air Lines 4 2026-05-10
DAL2437 Delta Air Lines 4 2026-06-04
DAL2340 Delta Air Lines 4 2026-04-16
DAL2284 Delta Air Lines 4 2026-06-10
DAL2124 Delta Air Lines 4 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL1273 - Jul 13, 20:40 UTCJul 13, 21:30 UTC50m
2026-07-13 DAL1273 GSP → ATL Jul 13, 20:38 UTCJul 13, 21:30 UTC52m
2026-07-13 DAL1273 - Jul 13, 17:10 UTCJul 13, 17:40 UTC30m
2026-07-13 DAL1571 STL → ATL Jul 13, 14:35 UTCJul 13, 15:50 UTC1h 15m
2026-07-13 DAL1571 STL → ATL Jul 13, 14:33 UTCJul 13, 15:44 UTC1h 11m
2026-07-13 DAL1571 ATL → STL Jul 13, 11:50 UTCJul 13, 13:00 UTC1h 10m
2026-07-12 DAL1359 - Jul 12, 20:45 UTCJul 12, 21:35 UTC50m
2026-07-12 DAL1359 ECP → ATL Jul 12, 20:45 UTCJul 12, 21:36 UTC51m
2026-07-12 DAL1359 ATL → ECP Jul 12, 16:40 UTCJul 12, 17:25 UTC45m
2026-07-12 DAL3048 - Jul 12, 14:35 UTCJul 12, 15:20 UTC45m
2026-07-12 DAL3048 ATL → ECP Jul 12, 12:15 UTCJul 12, 12:55 UTC40m
2026-07-12 DAL409 SEA → ATL Jul 12, 06:25 UTCJul 12, 10:30 UTC4h 5m
2026-07-12 DAL2640 - Jul 12, 01:05 UTCJul 12, 03:05 UTC2h 0m
2026-07-12 DAL2640 LAX → SEA Jul 12, 01:03 UTCJul 12, 03:02 UTC1h 59m
2026-07-11 DAL841 SLC → LAX Jul 11, 22:25 UTCJul 11, 23:50 UTC1h 25m
2026-07-11 DAL935 - Jul 11, 16:30 UTCJul 11, 19:50 UTC3h 20m
2026-07-11 DAL1262 ATL → DTW Jul 11, 00:55 UTCJul 11, 02:25 UTC1h 30m
2026-07-10 DAL3169 - Jul 10, 20:35 UTCJul 10, 22:15 UTC1h 40m
2026-07-10 DAL3169 CVG → ATL Jul 10, 20:33 UTCJul 10, 22:14 UTC1h 41m
2026-07-10 DAL3169 ATL → CVG Jul 10, 18:15 UTCJul 10, 19:15 UTC1h 0m
2026-07-10 DAL886 CVG → SEA Jul 10, 13:15 UTCJul 10, 16:30 UTC3h 15m
2026-07-10 DAL1251 ATL → TUS Jul 10, 02:05 UTCJul 10, 05:10 UTC3h 5m
2026-07-10 DAL1251 ATL → TUS Jul 10, 02:05 UTCJul 10, 05:07 UTC3h 2m
2026-07-09 DAL2739 - Jul 9, 22:25 UTCJul 10, 00:25 UTC2h 0m
2026-07-09 DAL2739 BDL → ATL Jul 9, 22:25 UTCJul 10, 00:28 UTC2h 3m
2026-07-09 DAL2739 ATL → BDL Jul 9, 18:30 UTCJul 9, 20:35 UTC2h 5m
2026-07-09 DAL2999 RDU → BOS Jul 9, 15:25 UTCJul 9, 16:55 UTC1h 30m
2026-07-09 DAL2999 RDU → BOS Jul 9, 12:10 UTCJul 9, 13:40 UTC1h 30m
2026-07-09 DAL3018 - Jul 9, 09:45 UTCJul 9, 10:35 UTC50m
2026-07-09 DAL3005 - Jul 9, 03:00 UTCJul 9, 03:45 UTC45m
2026-07-09 DAL3005 ATL → GSO Jul 9, 02:59 UTCJul 9, 03:45 UTC46m
2026-07-08 DAL2293 JFK → ATL Jul 8, 22:20 UTCJul 9, 00:05 UTC1h 45m
2026-07-08 DAL1918 - Jul 8, 17:40 UTCJul 8, 19:40 UTC2h 0m
2026-07-08 DAL1907 JFK → NAS Jul 8, 12:30 UTCJul 8, 14:40 UTC2h 10m
2026-07-07 DAL305 - Jul 7, 23:30 UTCJul 8, 02:25 UTC2h 55m
2026-07-07 DAL305 JFK → FLL Jul 7, 19:10 UTCJul 7, 21:30 UTC2h 20m
2026-07-07 DAL1411 AUS → JFK Jul 7, 12:55 UTCJul 7, 16:10 UTC3h 15m
2026-07-06 DAL1233 JFK → AUS Jul 6, 23:35 UTCJul 7, 03:10 UTC3h 35m
2026-07-06 DAL1918 - Jul 6, 17:35 UTCJul 6, 19:45 UTC2h 10m
2026-07-06 DAL1907 JFK → NAS Jul 6, 13:12 UTCJul 6, 15:39 UTC2h 27m
2026-07-06 DAL1907 JFK → NAS Jul 6, 13:15 UTCJul 6, 15:15 UTC2h 0m
2026-07-06 DAL2398 ATL → JFK Jul 6, 00:25 UTCJul 6, 02:40 UTC2h 15m
2026-07-05 DAL2135 IAD → ATL Jul 5, 20:06 UTCJul 5, 21:18 UTC1h 12m
2026-07-05 DAL2135 IAD → ATL Jul 5, 20:10 UTCJul 5, 21:20 UTC1h 10m
2026-07-05 DAL2135 ATL → IAD Jul 5, 17:05 UTCJul 5, 18:25 UTC1h 20m
2026-07-05 DAL1380 - Jul 5, 14:30 UTCJul 5, 15:40 UTC1h 10m
2026-07-05 DAL1380 - Jul 5, 12:00 UTCJul 5, 13:15 UTC1h 15m
2026-07-04 DAL1867 - Jul 4, 20:45 UTCJul 5, 00:25 UTC3h 40m
2026-07-04 DAL1788 HAV → MIA Jul 4, 14:55 UTCJul 4, 18:10 UTC3h 15m
2026-07-04 DAL2299 - Jul 4, 12:15 UTCJul 4, 13:10 UTC55m

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 N857DZ page for operator, model, and routing details .

Mode-S ABC1BC frequently asked

What is Mode-S code ABC1BC?
ABC1BC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N857DZ.
Where is Mode-S ABC1BC registered?
Mode-S code ABC1BC 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 ABC1BC broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABC1BC, octal 52740674, decimal 11,256,252.
What flights does ABC1BC operate?
Mode-S ABC1BC has broadcast 20 distinct callsigns, including DAL1907, DAL1918, DAL2397, DAL1411, DAL809.