Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast 2h ago
Flights observed
506
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A057C7.

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
DAL2699 Delta Air Lines 12 2026-05-09
DAL1623 Delta Air Lines 12 2026-05-29
DAL1024 - 12 2026-07-14
DAL2798 - 11 2026-07-11
DAL1342 - 9 2026-07-11
DAL1254 - 9 2026-07-13
DAL1198 - 9 2026-06-24
DAL2514 - 8 2026-07-02
DAL1583 - 8 2026-07-08
DAL1553 - 8 2026-06-20
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
DAL1555 Delta Air Lines 7 2026-06-19
DAL1260 - 7 2026-07-09
DAL2680 - 6 2026-06-30
DAL2533 Delta Air Lines 6 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-13 DAL1254 SLC → SJC Jul 13, 18:05 UTCJul 13, 19:35 UTC1h 30m
2026-07-13 DAL1024 - Jul 13, 03:25 UTCJul 13, 04:45 UTC1h 20m
2026-07-13 DAL1024 SLC → GEG Jul 13, 01:25 UTCJul 13, 02:40 UTC1h 15m
2026-07-11 DAL1342 SMF → SLC Jul 11, 23:55 UTCJul 12, 01:10 UTC1h 15m
2026-07-11 DAL1342 SLC → SMF Jul 11, 21:45 UTCJul 11, 23:00 UTC1h 15m
2026-07-11 DAL2798 DFW → SLC Jul 11, 18:30 UTCJul 11, 20:40 UTC2h 10m
2026-07-11 DAL2798 SLC → DFW Jul 11, 15:10 UTCJul 11, 17:15 UTC2h 5m
2026-07-11 DAL2585 - Jul 11, 02:20 UTCJul 11, 03:30 UTC1h 10m
2026-07-10 DAL2585 SLC → SMF Jul 10, 23:55 UTCJul 11, 01:15 UTC1h 20m
2026-07-10 DAL1254 - Jul 10, 20:45 UTCJul 10, 22:15 UTC1h 30m
2026-07-10 DAL1254 SLC → SJC Jul 10, 17:45 UTCJul 10, 19:15 UTC1h 30m
2026-07-10 DAL2363 STL → SLC Jul 10, 13:00 UTCJul 10, 15:50 UTC2h 50m
2026-07-10 DAL2666 - Jul 10, 03:00 UTCJul 10, 05:30 UTC2h 30m
2026-07-09 DAL2903 - Jul 9, 23:10 UTCJul 10, 01:35 UTC2h 25m
2026-07-09 DAL2903 - Jul 9, 20:00 UTCJul 9, 21:50 UTC1h 50m
2026-07-09 DAL1260 - Jul 9, 00:05 UTCJul 9, 01:25 UTC1h 20m
2026-07-09 DAL1260 SJC → SLC Jul 9, 00:01 UTCJul 9, 01:22 UTC1h 21m
2026-07-08 DAL1260 SLC → SJC Jul 8, 21:20 UTCJul 8, 22:55 UTC1h 35m
2026-07-08 DAL1442 - Jul 8, 19:15 UTCJul 8, 20:05 UTC50m
2026-07-08 DAL1442 - Jul 8, 17:15 UTCJul 8, 18:00 UTC45m
2026-07-08 DAL1583 - Jul 8, 12:55 UTCJul 8, 15:35 UTC2h 40m
2026-07-08 DAL2683 - Jul 8, 00:00 UTCJul 8, 02:15 UTC2h 15m
2026-07-07 DAL2057 - Jul 7, 17:45 UTCJul 7, 19:20 UTC1h 35m
2026-07-07 DAL2057 MSP → CLE Jul 7, 15:10 UTCJul 7, 16:35 UTC1h 25m
2026-07-07 DAL1717 BOS → LGA Jul 7, 12:40 UTCJul 7, 13:35 UTC55m
2026-07-07 DAL1563 MSP → ORD Jul 7, 00:55 UTCJul 7, 02:05 UTC1h 10m
2026-07-06 DAL2181 GSO → ATL Jul 6, 20:20 UTCJul 6, 22:20 UTC2h 0m
2026-07-06 DAL2181 GSO → ATL Jul 6, 17:10 UTCJul 6, 19:05 UTC1h 55m
2026-07-06 DAL1717 BOS → LGA Jul 6, 13:00 UTCJul 6, 14:00 UTC1h 0m
2026-07-06 DAL1563 MSP → ORD Jul 6, 00:59 UTCJul 6, 01:50 UTC51m
2026-07-06 DAL1563 - Jul 6, 01:00 UTCJul 6, 01:45 UTC45m
2026-07-05 DAL2061 - Jul 5, 20:00 UTCJul 5, 23:05 UTC3h 5m
2026-07-05 DAL2061 SNA → MSP Jul 5, 19:58 UTCJul 5, 23:04 UTC3h 6m
2026-07-05 DAL1835 PUJ → MSP Jul 5, 17:15 UTCJul 5, 18:45 UTC1h 30m
2026-07-05 DAL1583 - Jul 5, 13:30 UTCJul 5, 16:10 UTC2h 40m
2026-07-05 DAL2683 - Jul 5, 00:00 UTCJul 5, 02:35 UTC2h 35m
2026-07-04 DAL2683 MSP → IAH Jul 4, 23:59 UTCJul 5, 02:33 UTC2h 34m
2026-07-04 DAL2885 - Jul 4, 21:05 UTCJul 4, 22:15 UTC1h 10m
2026-07-04 DAL2885 - Jul 4, 19:00 UTCJul 4, 20:00 UTC1h 0m
2026-07-04 DAL3188 - Jul 4, 16:20 UTCJul 4, 17:30 UTC1h 10m
2026-07-04 DAL3188 - Jul 4, 14:15 UTCJul 4, 15:20 UTC1h 5m
2026-07-04 DAL2491 - Jul 4, 10:30 UTCJul 4, 12:40 UTC2h 10m
2026-07-04 DAL2929 - Jul 4, 01:45 UTCJul 4, 03:50 UTC2h 5m
2026-07-03 DAL3185 ATL → CLT Jul 3, 22:40 UTCJul 3, 23:55 UTC1h 15m
2026-07-03 DAL3185 ATL → CLT Jul 3, 20:25 UTCJul 3, 21:35 UTC1h 10m
2026-07-03 DAL2864 - Jul 3, 16:25 UTCJul 3, 18:40 UTC2h 15m

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?
No active broadcast right now. Last signal was 2h ago.
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, DAL2699, DAL1623, DAL1024.