Apparatus

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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
Broadcasting now · callsign DAL1946 · 33,000 ft
Flights observed
527
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Current position

ABC1BC is currently broadcasting. Map zoomed to live position.

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
DAL937 - 6 2026-07-21
DAL809 Delta Air Lines 6 2026-04-17
DAL1730 Delta Air Lines 6 2026-06-09
DAL3169 - 5 2026-07-20
DAL2999 Delta Air Lines 5 2026-07-09
DAL2280 Delta Air Lines 5 2026-05-27
DAL1757 - 5 2026-07-17
DAL1663 - 5 2026-06-24
DAL1643 Delta Air Lines 5 2026-07-25
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
DAL2831 Delta Air Lines 4 2026-07-17
DAL2700 Delta Air Lines 4 2026-06-19
DAL2651 Delta Air Lines 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2300 BDL → DTW Jul 26, 19:30 UTCJul 26, 22:00 UTC2h 30m
2026-07-26 DAL770 SEA → BOS Jul 26, 15:20 UTCJul 26, 17:25 UTC2h 5m
2026-07-26 DAL2042 JFK → TPA Jul 26, 11:35 UTCJul 26, 13:55 UTC2h 20m
2026-07-25 DAL1643 ATL → MSN Jul 25, 22:20 UTCJul 26, 01:45 UTC3h 25m
2026-07-25 DAL1643 ATL → MSN Jul 25, 17:05 UTCJul 25, 20:20 UTC3h 15m
2026-07-25 DAL1034 ATL → LGA Jul 25, 13:50 UTCJul 25, 15:30 UTC1h 40m
2026-07-25 DAL3106 IND → ATL Jul 25, 11:10 UTCJul 25, 12:15 UTC1h 5m
2026-07-25 DAL2657 LAX → SFO Jul 25, 03:15 UTCJul 25, 04:15 UTC1h 0m
2026-07-24 DAL2542 ATL → BDL Jul 24, 22:40 UTCJul 24, 23:45 UTC1h 5m
2026-07-24 DAL2542 ATL → BDL Jul 24, 15:20 UTCJul 24, 16:20 UTC1h 0m
2026-07-24 DAL2542 ATL → BDL Jul 24, 15:18 UTCJul 24, 16:20 UTC1h 2m
2026-07-24 DAL3076 MCI → ATL Jul 24, 12:20 UTCJul 24, 13:25 UTC1h 5m
2026-07-23 DAL3119 ATL → CVG Jul 23, 22:15 UTCJul 23, 23:10 UTC55m
2026-07-23 DAL3012 BHM → ATL Jul 23, 19:45 UTCJul 23, 20:15 UTC30m
2026-07-23 DAL3012 BHM → ATL Jul 23, 17:50 UTCJul 23, 18:10 UTC20m
2026-07-23 DAL1592 ATL → BWI Jul 23, 14:50 UTCJul 23, 16:10 UTC1h 20m
2026-07-23 DAL1592 ATL → BWI Jul 23, 11:55 UTCJul 23, 13:15 UTC1h 20m
2026-07-23 DAL635 BOS → DFW Jul 23, 05:40 UTCJul 23, 09:10 UTC3h 30m
2026-07-23 DAL704 DAL → ATL Jul 23, 00:05 UTCJul 23, 04:05 UTC4h 0m
2026-07-22 DAL2894 ATL → PHL Jul 22, 20:25 UTCJul 22, 21:45 UTC1h 20m
2026-07-22 DAL2894 ATL → PHL Jul 22, 20:24 UTCJul 22, 21:46 UTC1h 22m
2026-07-22 DAL2894 ATL → PHL Jul 22, 16:45 UTCJul 22, 18:30 UTC1h 45m
2026-07-22 DAL2426 ORD → ATL Jul 22, 14:00 UTCJul 22, 15:20 UTC1h 20m
2026-07-22 DAL1199 FLL → DTW Jul 22, 03:00 UTCJul 22, 05:00 UTC2h 0m
2026-07-21 DAL937 - Jul 21, 21:00 UTCJul 22, 00:10 UTC3h 10m
2026-07-21 DAL937 ATL → TUS Jul 21, 16:10 UTCJul 21, 19:15 UTC3h 5m
2026-07-21 DAL2426 ORD → ATL Jul 21, 13:20 UTCJul 21, 14:40 UTC1h 20m
2026-07-21 DAL2426 ORD → ATL Jul 21, 13:20 UTCJul 21, 14:38 UTC1h 18m
2026-07-20 DAL2486 BOS → LAS Jul 20, 23:30 UTCJul 21, 01:05 UTC1h 34m
2026-07-20 DAL2486 BOS → LAS Jul 20, 23:28 UTCJul 21, 00:58 UTC1h 30m
2026-07-20 DAL3169 - Jul 20, 20:35 UTCJul 20, 21:40 UTC1h 5m
2026-07-20 DAL3169 ATL → CVG Jul 20, 18:00 UTCJul 20, 19:00 UTC1h 0m
2026-07-20 DAL3196 - Jul 20, 15:15 UTCJul 20, 16:20 UTC1h 5m
2026-07-20 DAL3196 ATL → SRQ Jul 20, 12:30 UTCJul 20, 13:40 UTC1h 10m
2026-07-20 DAL3028 - Jul 20, 10:00 UTCJul 20, 10:30 UTC30m
2026-07-20 DAL2281 SFO → SEA Jul 20, 03:50 UTCJul 20, 04:20 UTC30m
2026-07-19 DAL937 TUS → ATL Jul 19, 20:55 UTCJul 20, 00:15 UTC3h 20m
2026-07-19 DAL937 ATL → TUS Jul 19, 16:10 UTCJul 19, 19:25 UTC3h 15m
2026-07-19 DAL1074 MSP → LGA Jul 19, 12:20 UTCJul 19, 14:45 UTC2h 25m
2026-07-19 DAL971 MSP → CMH Jul 19, 03:20 UTCJul 19, 05:40 UTC2h 20m
2026-07-18 DAL2206 PDX → ATL Jul 18, 21:25 UTCJul 19, 01:40 UTC4h 15m
2026-07-18 DAL2206 ATL → PDX Jul 18, 21:24 UTCJul 19, 01:33 UTC4h 9m
2026-07-18 DAL2206 ATL → PDX Jul 18, 15:10 UTCJul 18, 19:35 UTC4h 25m
2026-07-18 DAL2299 - Jul 18, 12:25 UTCJul 18, 13:20 UTC55m
2026-07-17 DAL2831 ATL → SDF Jul 17, 22:10 UTCJul 17, 23:10 UTC1h 0m
2026-07-17 DAL1757 - Jul 17, 19:20 UTCJul 17, 20:20 UTC1h 0m
2026-07-17 DAL1757 - Jul 17, 16:59 UTCJul 17, 17:15 UTC15m
2026-07-17 DAL1757 SJU → ATL Jul 17, 16:59 UTCJul 17, 20:15 UTC3h 16m
2026-07-17 DAL1757 - Jul 17, 15:25 UTCJul 17, 15:44 UTC20m
2026-07-17 DAL1757 - Jul 17, 12:30 UTCJul 17, 13:55 UTC1h 25m

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?
Yes. Mode-S ABC1BC is currently airborne.
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, DAL937.