Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3725A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N321DH · AIRBUS A-321 · operated by UMB BANK NA TRUSTEE

Hex
A3725A
Octal
50671132
Decimal
10,711,642
Country
US
Tail
N321DH
Type
A321
Broadcasting now · callsign DAL2886 · 34,000 ft
Flights observed
457
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

A3725A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A3725A 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
DAL2104 - 10 2026-06-25
DAL1167 - 10 2026-07-13
DAL2131 Delta Air Lines 9 2026-07-22
DAL2011 - 9 2026-07-15
DAL1585 Delta Air Lines 9 2026-07-26
DAL2301 - 8 2026-07-12
DAL1341 Delta Air Lines 8 2026-06-23
DAL2187 Delta Air Lines 7 2026-04-30
DAL1602 - 7 2026-07-11
DAL838 Delta Air Lines 6 2026-07-25
DAL2777 Delta Air Lines 6 2026-07-22
DAL2724 - 6 2026-07-09
DAL2266 Delta Air Lines 6 2026-05-31
DAL1315 Delta Air Lines 6 2026-06-24
DAL1258 - 6 2026-07-21
DAL1241 - 6 2026-07-02
DAL2090 - 5 2026-07-07
DAL1916 Delta Air Lines 5 2026-05-04
DAL1578 - 5 2026-07-11
DAL1572 Delta Air Lines 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2799 ATL → BWI Jul 26, 21:30 UTCJul 26, 22:30 UTC1h 0m
2026-07-26 DAL2799 ATL → BWI Jul 26, 18:20 UTCJul 26, 19:55 UTC1h 35m
2026-07-26 DAL1585 ATL → IAH Jul 26, 14:55 UTCJul 26, 16:30 UTC1h 35m
2026-07-26 DAL1585 ATL → IAH Jul 26, 14:52 UTCJul 26, 16:32 UTC1h 40m
2026-07-26 DAL1585 ATL → IAH Jul 26, 11:45 UTCJul 26, 13:20 UTC1h 35m
2026-07-25 DAL838 PVD → ATL Jul 25, 23:05 UTCJul 26, 00:40 UTC1h 35m
2026-07-25 DAL838 PVD → ATL Jul 25, 23:02 UTCJul 26, 00:46 UTC1h 44m
2026-07-25 DAL838 PVD → ATL Jul 25, 21:25 UTCJul 25, 21:40 UTC15m
2026-07-25 DAL838 PVD → ATL Jul 25, 18:15 UTCJul 25, 20:15 UTC2h 0m
2026-07-25 DAL1227 IAH → LGA Jul 25, 15:20 UTCJul 25, 16:25 UTC1h 5m
2026-07-25 DAL1227 IAH → LGA Jul 25, 12:50 UTCJul 25, 13:50 UTC1h 0m
2026-07-25 DAL374 SFO → BOS Jul 25, 00:45 UTCJul 25, 02:30 UTC1h 45m
2026-07-24 DAL374 SFO → BOS Jul 24, 21:20 UTCJul 24, 23:20 UTC2h 0m
2026-07-24 DAL1153 BOS → DFW Jul 24, 17:35 UTCJul 24, 18:55 UTC1h 20m
2026-07-24 DAL1153 BOS → DFW Jul 24, 14:40 UTCJul 24, 15:55 UTC1h 15m
2026-07-24 DAL1352 SLC → SFO Jul 24, 11:20 UTCJul 24, 12:40 UTC1h 20m
2026-07-23 DAL959 DEN → ATL Jul 23, 21:05 UTCJul 23, 22:20 UTC1h 15m
2026-07-23 DAL959 DEN → ATL Jul 23, 21:01 UTCJul 23, 22:19 UTC1h 18m
2026-07-23 DAL1512 ATL → FLL Jul 23, 18:00 UTCJul 23, 19:25 UTC1h 25m
2026-07-23 DAL1512 ATL → FLL Jul 23, 17:59 UTCJul 23, 19:19 UTC1h 20m
2026-07-23 DAL1512 ATL → FLL Jul 23, 15:00 UTCJul 23, 16:25 UTC1h 25m
2026-07-23 DAL2579 ONT → SEA Jul 23, 11:30 UTCJul 23, 13:00 UTC1h 30m
2026-07-23 DAL1257 ORD → LGA Jul 23, 00:20 UTCJul 23, 01:45 UTC1h 25m
2026-07-22 DAL2131 BOS → TPA Jul 22, 21:05 UTCJul 22, 22:35 UTC1h 30m
2026-07-22 DAL2131 BOS → TPA Jul 22, 17:40 UTCJul 22, 19:15 UTC1h 35m
2026-07-22 DAL2777 DTW → ATL Jul 22, 14:35 UTCJul 22, 16:10 UTC1h 35m
2026-07-22 DAL2777 DTW → ATL Jul 22, 14:31 UTCJul 22, 16:05 UTC1h 34m
2026-07-22 DAL1432 DAL → ATL Jul 22, 00:50 UTCJul 22, 02:35 UTC1h 45m
2026-07-21 DAL1171 DTW → BOS Jul 21, 21:05 UTCJul 21, 23:00 UTC1h 55m
2026-07-21 DAL1240 FLL → LGA Jul 21, 15:20 UTCJul 21, 16:50 UTC1h 30m
2026-07-21 DAL1258 AUS → ATL Jul 21, 11:35 UTCJul 21, 13:25 UTC1h 50m
2026-07-21 DAL1335 MSY → LGA Jul 21, 03:18 UTCJul 21, 05:01 UTC1h 43m
2026-07-21 DAL1335 MSY → LGA Jul 21, 03:20 UTCJul 21, 05:05 UTC1h 45m
2026-07-21 DAL1323 MIA → ATL Jul 21, 00:30 UTCJul 21, 01:45 UTC1h 15m
2026-07-20 DAL1323 MIA → ATL Jul 20, 21:20 UTCJul 20, 22:55 UTC1h 35m
2026-07-20 DAL1153 BOS → DFW Jul 20, 17:35 UTCJul 20, 18:45 UTC1h 10m
2026-07-20 DAL1153 BOS → DFW Jul 20, 14:40 UTCJul 20, 15:55 UTC1h 15m
2026-07-18 DAL761 TPA → LGA Jul 18, 16:20 UTCJul 18, 20:20 UTC4h 0m
2026-07-18 DAL761 TPA → LGA Jul 18, 16:18 UTCJul 18, 20:17 UTC3h 59m
2026-07-18 DAL779 ATL → ONT Jul 18, 02:24 UTCJul 18, 06:12 UTC3h 48m
2026-07-18 DAL779 ATL → ONT Jul 18, 02:25 UTCJul 18, 06:10 UTC3h 46m
2026-07-17 DAL1572 FLL → BOS Jul 17, 22:10 UTCJul 17, 23:50 UTC1h 40m
2026-07-17 DAL1572 FLL → BOS Jul 17, 22:05 UTCJul 17, 23:49 UTC1h 44m
2026-07-17 DAL1572 FLL → BOS Jul 17, 16:49 UTCJul 17, 18:25 UTC1h 35m
2026-07-16 DAL1236 - Jul 16, 12:00 UTCJul 16, 13:40 UTC1h 40m
2026-07-15 DAL2388 ATL → MKE Jul 15, 22:30 UTCJul 16, 00:00 UTC1h 30m
2026-07-15 DAL2011 AUS → ATL Jul 15, 18:40 UTCJul 15, 20:30 UTC1h 50m
2026-07-15 DAL2011 ATL → AUS Jul 15, 15:20 UTCJul 15, 17:15 UTC1h 55m
2026-07-15 DAL893 DFW → ATL Jul 15, 12:05 UTCJul 15, 13:45 UTC1h 40m
2026-07-14 DAL436 ATL → DFW Jul 14, 22:00 UTCJul 15, 00:00 UTC1h 59m

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 N321DH page for operator, model, and routing details .

Mode-S A3725A frequently asked

What is Mode-S code A3725A?
A3725A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N321DH.
Where is Mode-S A3725A registered?
Mode-S code A3725A 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 A3725A broadcasting right now?
Yes. Mode-S A3725A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3725A, octal 50671132, decimal 10,711,642.
What flights does A3725A operate?
Mode-S A3725A has broadcast 20 distinct callsigns, including DAL2104, DAL1167, DAL2131, DAL2011, DAL1585.