Apparatus

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sensors Mode-S transponder

A05F31

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N123DQ · AIRBUS A220-100 · operated by BANK OF UTAH TRUSTEE

Hex
A05F31
Octal
50057461
Decimal
10,510,129
Country
US
Tail
N123DQ
Type
BCS1
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
477
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A05F31.

Country allocation

The ICAO 24-bit address A05F31 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
DAL2245 Delta Air Lines 23 2026-05-10
DAL2972 Delta Air Lines 11 2026-07-05
DAL2866 Delta Air Lines 9 2026-07-06
DAL2792 Delta Air Lines 9 2026-06-09
DAL2585 - 9 2026-07-16
DAL1553 - 9 2026-07-16
DAL1503 Delta Air Lines 9 2026-07-19
DAL1260 - 9 2026-07-17
DAL2963 Delta Air Lines 8 2026-06-26
DAL2113 Delta Air Lines 8 2026-05-11
DAL2057 Delta Air Lines 8 2026-06-25
DAL1342 Delta Air Lines 8 2026-07-26
DAL2521 Delta Air Lines 7 2026-05-03
DAL2798 - 6 2026-07-14
DAL2772 - 6 2026-06-30
DAL2156 Delta Air Lines 6 2026-06-16
DAL2101 Delta Air Lines 6 2026-04-13
DAL1532 Delta Air Lines 6 2026-07-24
DAL1449 - 6 2026-06-25
DAL1314 - 6 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2285 MSP → DCA Jul 26, 19:35 UTCJul 26, 21:45 UTC2h 10m
2026-07-26 DAL561 SFO → JFK Jul 26, 17:20 UTCJul 26, 18:15 UTC55m
2026-07-26 DAL561 SFO → JFK Jul 26, 15:20 UTCJul 26, 16:15 UTC55m
2026-07-26 DAL1050 IAH → MSP Jul 26, 11:45 UTCJul 26, 14:05 UTC2h 20m
2026-07-26 DAL2514 IND → ATL Jul 26, 03:40 UTCJul 26, 06:15 UTC2h 35m
2026-07-26 DAL1342 IAH → MSP Jul 26, 00:15 UTCJul 26, 01:30 UTC1h 15m
2026-07-25 DAL1342 IAH → MSP Jul 25, 21:50 UTCJul 25, 23:10 UTC1h 20m
2026-07-25 DAL2813 RDU → MSP Jul 25, 19:35 UTCJul 25, 20:50 UTC1h 15m
2026-07-25 DAL2813 RDU → MSP Jul 25, 16:30 UTCJul 25, 17:30 UTC1h 0m
2026-07-25 DAL2716 PVD → ATL Jul 25, 12:10 UTCJul 25, 15:05 UTC2h 55m
2026-07-25 DAL2716 PVD → ATL Jul 25, 12:07 UTCJul 25, 14:56 UTC2h 49m
2026-07-25 DAL2619 ATL → LGA Jul 25, 00:05 UTCJul 25, 02:35 UTC2h 30m
2026-07-24 DAL1532 IAH → SLC Jul 24, 20:00 UTCJul 24, 22:40 UTC2h 40m
2026-07-24 DAL2502 ATL → BNA Jul 24, 16:05 UTCJul 24, 18:35 UTC2h 30m
2026-07-24 DAL1492 JFK → DEN Jul 24, 02:30 UTCJul 24, 05:20 UTC2h 50m
2026-07-23 DAL1492 JFK → DEN Jul 23, 23:10 UTCJul 24, 01:30 UTC2h 20m
2026-07-19 DAL1503 JFK → ATL Jul 19, 02:00 UTCJul 19, 03:15 UTC1h 15m
2026-07-18 DAL1503 JFK → ATL Jul 18, 21:35 UTCJul 18, 22:50 UTC1h 15m
2026-07-18 DAL2813 - Jul 18, 19:10 UTCJul 18, 20:25 UTC1h 15m
2026-07-18 DAL2813 FCA → SLC Jul 18, 18:59 UTCJul 18, 20:17 UTC1h 18m
2026-07-18 DAL2813 - Jul 18, 16:15 UTCJul 18, 17:15 UTC1h 0m
2026-07-18 DAL2544 DEN → SLC Jul 18, 11:50 UTCJul 18, 12:55 UTC1h 5m
2026-07-18 DAL2544 DEN → SLC Jul 18, 11:48 UTCJul 18, 12:49 UTC1h 1m
2026-07-18 DAL1586 SLC → DEN Jul 18, 00:43 UTCJul 18, 01:46 UTC1h 3m
2026-07-18 DAL1586 SLC → DEN Jul 18, 00:45 UTCJul 18, 01:50 UTC1h 5m
2026-07-17 DAL1623 DEN → SLC Jul 17, 22:10 UTCJul 17, 23:10 UTC1h 0m
2026-07-17 DAL1623 DEN → SLC Jul 17, 22:07 UTCJul 17, 23:06 UTC59m
2026-07-17 DAL1623 SLC → DEN Jul 17, 20:00 UTCJul 17, 21:00 UTC1h 0m
2026-07-17 DAL1260 - Jul 17, 00:30 UTCJul 17, 01:59 UTC1h 30m
2026-07-17 DAL1260 SJC → SLC Jul 17, 00:25 UTCJul 17, 01:52 UTC1h 27m
2026-07-16 DAL1260 SLC → SJC Jul 16, 21:19 UTCJul 16, 22:55 UTC1h 35m
2026-07-16 DAL1553 DEN → SLC Jul 16, 18:51 UTCJul 16, 19:48 UTC57m
2026-07-16 DAL1553 DEN → SLC Jul 16, 18:55 UTCJul 16, 19:55 UTC1h 0m
2026-07-16 DAL1553 SLC → DEN Jul 16, 16:25 UTCJul 16, 17:30 UTC1h 5m
2026-07-16 DAL1553 SLC → DEN Jul 16, 16:22 UTCJul 16, 17:24 UTC1h 2m
2026-07-16 DAL1314 SJC → SLC Jul 16, 13:45 UTCJul 16, 15:05 UTC1h 20m
2026-07-16 DAL1272 SLC → SJC Jul 16, 05:10 UTCJul 16, 06:40 UTC1h 30m
2026-07-16 DAL2585 - Jul 16, 02:25 UTCJul 16, 03:45 UTC1h 20m
2026-07-15 DAL2585 SLC → SMF Jul 15, 23:55 UTCJul 16, 01:10 UTC1h 15m
2026-07-15 DAL2585 SMF → SLC Jul 15, 02:40 UTCJul 15, 04:00 UTC1h 20m
2026-07-15 DAL2585 SMF → SLC Jul 15, 02:40 UTCJul 15, 03:54 UTC1h 14m
2026-07-14 DAL2585 SLC → SMF Jul 14, 23:55 UTCJul 15, 01:10 UTC1h 15m
2026-07-14 DAL2798 DFW → SLC Jul 14, 20:50 UTCJul 14, 22:55 UTC2h 4m
2026-07-14 DAL2798 - Jul 14, 14:10 UTCJul 14, 16:20 UTC2h 10m
2026-07-14 DAL1260 - Jul 14, 00:05 UTCJul 14, 01:35 UTC1h 30m
2026-07-14 DAL1260 SJC → SLC Jul 14, 00:03 UTCJul 14, 01:25 UTC1h 22m
2026-07-13 DAL1260 SLC → SJC Jul 13, 21:20 UTCJul 13, 22:50 UTC1h 30m
2026-07-12 DAL1532 - Jul 12, 19:45 UTCJul 12, 22:15 UTC2h 30m
2026-07-12 DAL1532 IAH → SLC Jul 12, 19:40 UTCJul 12, 22:23 UTC2h 43m
2026-07-12 DAL2502 SLC → IAH Jul 12, 15:36 UTCJul 12, 18:10 UTC2h 34m

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 N123DQ page for operator, model, and routing details .

Mode-S A05F31 frequently asked

What is Mode-S code A05F31?
A05F31 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N123DQ.
Where is Mode-S A05F31 registered?
Mode-S code A05F31 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 A05F31 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05F31, octal 50057461, decimal 10,510,129.
What flights does A05F31 operate?
Mode-S A05F31 has broadcast 20 distinct callsigns, including DAL2245, DAL2972, DAL2866, DAL2792, DAL2585.