Apparatus

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sensors Mode-S transponder

A057C7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N121DU · AIRBUS A220-100 · operated by BANK OF UTAH TRUSTEE

Hex
A057C7
Octal
50053707
Decimal
10,508,231
Country
US
Tail
N121DU
Type
BCS1
Broadcasting now · callsign DAL2502 · 37,000 ft
Flights observed
552
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 00:30 UTC

Current position

A057C7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A057C7 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
DAL2656 Delta Air Lines 16 2026-05-09
DAL1449 Delta Air Lines 15 2026-06-09
DAL1024 Delta Air Lines 15 2026-07-25
DAL1254 Delta Air Lines 13 2026-07-24
DAL2699 Delta Air Lines 12 2026-05-09
DAL1623 Delta Air Lines 12 2026-05-29
DAL2798 - 11 2026-07-11
DAL1553 Delta Air Lines 9 2026-07-23
DAL1342 - 9 2026-07-11
DAL1198 - 9 2026-06-24
DAL2514 - 8 2026-07-02
DAL1583 - 8 2026-07-08
DAL1116 Delta Air Lines 8 2026-05-27
DAL803 Delta Air Lines 7 2026-05-01
DAL2920 - 7 2026-06-29
DAL2864 - 7 2026-07-03
DAL2320 Delta Air Lines 7 2026-07-18
DAL1555 Delta Air Lines 7 2026-06-19
DAL1260 - 7 2026-07-09
DAL496 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 DAL1185 LGA → MSY Jul 25, 19:10 UTCJul 25, 20:35 UTC1h 25m
2026-07-25 DAL1304 DTW → SFO Jul 25, 16:50 UTCJul 25, 18:15 UTC1h 25m
2026-07-25 DAL1314 BOS → SFO Jul 25, 13:05 UTCJul 25, 14:25 UTC1h 20m
2026-07-25 DAL1272 JFK → FLL Jul 25, 04:55 UTCJul 25, 06:25 UTC1h 30m
2026-07-25 DAL1024 ATL → CHA Jul 25, 02:05 UTCJul 25, 03:30 UTC1h 25m
2026-07-25 DAL1024 ATL → CHA Jul 25, 02:04 UTCJul 25, 03:34 UTC1h 30m
2026-07-24 DAL1024 ATL → CHA Jul 24, 23:35 UTCJul 25, 00:55 UTC1h 20m
2026-07-24 DAL1254 ATL → PVD Jul 24, 20:45 UTCJul 24, 22:15 UTC1h 30m
2026-07-24 DAL1254 ATL → PVD Jul 24, 18:05 UTCJul 24, 19:40 UTC1h 35m
2026-07-23 DAL1492 JFK → DEN Jul 23, 18:55 UTCJul 23, 20:00 UTC1h 5m
2026-07-23 DAL1553 JFK → TPA Jul 23, 16:30 UTCJul 23, 17:30 UTC1h 0m
2026-07-23 DAL2716 PVD → ATL Jul 23, 12:05 UTCJul 23, 15:00 UTC2h 55m
2026-07-23 DAL2716 PVD → ATL Jul 23, 12:03 UTCJul 23, 14:55 UTC2h 52m
2026-07-23 DAL2619 ATL → LGA Jul 23, 00:30 UTCJul 23, 03:00 UTC2h 30m
2026-07-22 DAL1254 ATL → PVD Jul 22, 21:05 UTCJul 22, 22:30 UTC1h 25m
2026-07-22 DAL1254 ATL → PVD Jul 22, 18:05 UTCJul 22, 19:30 UTC1h 25m
2026-07-22 DAL2363 STL → SLC Jul 22, 13:15 UTCJul 22, 15:50 UTC2h 35m
2026-07-22 DAL1609 TUS → ATL Jul 22, 03:05 UTCJul 22, 04:05 UTC1h 0m
2026-07-20 DAL1613 - Jul 20, 22:00 UTCJul 20, 23:20 UTC1h 20m
2026-07-20 DAL1613 - Jul 20, 19:45 UTCJul 20, 20:50 UTC1h 5m
2026-07-20 DAL561 - Jul 20, 17:40 UTCJul 20, 18:35 UTC55m
2026-07-20 DAL561 MKE → MSP Jul 20, 17:39 UTCJul 20, 18:31 UTC52m
2026-07-20 DAL561 - Jul 20, 15:55 UTCJul 20, 16:40 UTC45m
2026-07-20 DAL2390 JFK → MSP Jul 20, 11:45 UTCJul 20, 14:35 UTC2h 50m
2026-07-20 DAL1316 - Jul 20, 01:10 UTCJul 20, 02:25 UTC1h 15m
2026-07-19 DAL2443 JFK → DTW Jul 19, 22:15 UTCJul 19, 23:40 UTC1h 25m
2026-07-19 DAL2443 JFK → DTW Jul 19, 22:15 UTCJul 19, 23:41 UTC1h 26m
2026-07-18 DAL2320 AUS → MSP Jul 18, 16:10 UTCJul 18, 18:45 UTC2h 35m
2026-07-18 DAL2320 AUS → MSP Jul 18, 12:10 UTCJul 18, 14:45 UTC2h 35m
2026-07-18 DAL1316 - Jul 18, 00:19 UTCJul 18, 01:39 UTC1h 20m
2026-07-17 DAL2443 - Jul 17, 21:10 UTCJul 17, 22:40 UTC1h 30m
2026-07-17 DAL2320 RSW → JFK Jul 17, 16:44 UTCJul 17, 19:25 UTC2h 40m
2026-07-17 DAL2320 JFK → RSW Jul 17, 13:00 UTCJul 17, 15:25 UTC2h 25m
2026-07-17 DAL1316 - Jul 17, 00:40 UTCJul 17, 02:05 UTC1h 25m
2026-07-16 DAL2443 JFK → DTW Jul 16, 21:40 UTCJul 16, 23:05 UTC1h 25m
2026-07-16 DAL2443 JFK → DTW Jul 16, 21:36 UTCJul 16, 23:01 UTC1h 25m
2026-07-16 DAL2320 RSW → JFK Jul 16, 16:49 UTCJul 16, 19:14 UTC2h 25m
2026-07-16 DAL2320 RSW → JFK Jul 16, 16:47 UTCJul 16, 19:18 UTC2h 31m
2026-07-16 DAL2320 JFK → RSW Jul 16, 12:30 UTCJul 16, 15:10 UTC2h 40m
2026-07-16 DAL1035 - Jul 16, 01:10 UTCJul 16, 03:00 UTC1h 50m
2026-07-15 DAL1035 - Jul 15, 18:10 UTCJul 15, 20:05 UTC1h 55m
2026-07-15 DAL454 DFW → JFK Jul 15, 13:30 UTCJul 15, 16:45 UTC3h 15m
2026-07-14 DAL496 JFK → DFW Jul 14, 22:50 UTCJul 15, 01:45 UTC2h 55m
2026-07-14 DAL496 JFK → DFW Jul 14, 22:47 UTCJul 15, 01:39 UTC2h 52m
2026-07-14 DAL2661 - Jul 14, 18:05 UTCJul 14, 20:30 UTC2h 25m
2026-07-14 DAL2156 SJC → MSP Jul 14, 13:35 UTCJul 14, 16:50 UTC3h 15m
2026-07-14 DAL1272 SLC → SJC Jul 14, 04:55 UTCJul 14, 06:20 UTC1h 25m
2026-07-14 DAL1024 GEG → SLC Jul 14, 02:10 UTCJul 14, 03:25 UTC1h 15m
2026-07-13 DAL1024 - Jul 13, 23:55 UTCJul 14, 01:05 UTC1h 10m
2026-07-13 DAL1254 RHV → SLC Jul 13, 20:50 UTCJul 13, 22:20 UTC1h 30m

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 N121DU page for operator, model, and routing details .

Mode-S A057C7 frequently asked

What is Mode-S code A057C7?
A057C7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N121DU.
Where is Mode-S A057C7 registered?
Mode-S code A057C7 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 A057C7 broadcasting right now?
Yes. Mode-S A057C7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A057C7, octal 50053707, decimal 10,508,231.
What flights does A057C7 operate?
Mode-S A057C7 has broadcast 20 distinct callsigns, including DAL2656, DAL1449, DAL1024, DAL1254, DAL2699.