Apparatus

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sensors Mode-S transponder

A4105B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N361DN · AIRBUS A-321 · operated by DELTA AIR LINES INC

Hex
A4105B
Octal
51010133
Decimal
10,752,091
Country
US
Tail
N361DN
Type
A321
No current signal · last broadcast 3h ago
Flights observed
490
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A4105B.

Country allocation

The ICAO 24-bit address A4105B 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
DAL961 - 13 2026-07-10
DAL2078 Delta Air Lines 8 2026-05-13
DAL2266 - 7 2026-07-11
DAL2264 Delta Air Lines 7 2026-05-04
DAL1815 Delta Air Lines 7 2026-06-20
DAL1512 Delta Air Lines 7 2026-05-31
DAL1295 Delta Air Lines 7 2026-06-01
DAL2642 Delta Air Lines 6 2026-04-28
DAL1458 Delta Air Lines 6 2026-06-04
DAL1397 - 6 2026-07-09
DAL1168 - 6 2026-06-22
DAL1010 Delta Air Lines 6 2026-05-03
DAL959 Delta Air Lines 5 2026-05-16
DAL2350 Delta Air Lines 5 2026-06-21
DAL2325 Delta Air Lines 5 2026-06-09
DAL2312 - 5 2026-07-01
DAL2270 Delta Air Lines 5 2026-05-25
DAL1348 - 5 2026-07-13
DAL1167 - 5 2026-07-03
DAL1094 Delta Air Lines 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL436 ATL → DFW Jul 14, 00:55 UTCJul 14, 02:55 UTC2h 0m
2026-07-13 DAL1341 - Jul 13, 20:00 UTCJul 13, 21:40 UTC1h 40m
2026-07-13 DAL1341 ATL → FLL Jul 13, 17:15 UTCJul 13, 18:40 UTC1h 25m
2026-07-13 DAL1415 - Jul 13, 14:40 UTCJul 13, 15:55 UTC1h 15m
2026-07-13 DAL1415 RIC → ATL Jul 13, 14:36 UTCJul 13, 15:48 UTC1h 12m
2026-07-13 DAL1348 ATL → RIC Jul 13, 01:30 UTCJul 13, 02:40 UTC1h 10m
2026-07-12 DAL1153 - Jul 12, 19:35 UTCJul 12, 21:05 UTC1h 30m
2026-07-12 DAL1153 RSW → ATL Jul 12, 19:32 UTCJul 12, 20:59 UTC1h 27m
2026-07-12 DAL1153 ATL → RSW Jul 12, 15:35 UTCJul 12, 16:55 UTC1h 20m
2026-07-12 DAL1673 EWR → ATL Jul 12, 12:35 UTCJul 12, 14:15 UTC1h 40m
2026-07-12 DAL1673 EWR → ATL Jul 12, 12:31 UTCJul 12, 14:12 UTC1h 41m
2026-07-12 DAL2498 ATL → EWR Jul 12, 02:20 UTCJul 12, 04:01 UTC1h 40m
2026-07-11 DAL2266 BUF → ATL Jul 11, 21:40 UTCJul 11, 23:25 UTC1h 45m
2026-07-11 DAL2266 ATL → BUF Jul 11, 18:35 UTCJul 11, 20:15 UTC1h 40m
2026-07-11 DAL2356 - Jul 11, 16:05 UTCJul 11, 16:55 UTC50m
2026-07-11 DAL2356 - Jul 11, 13:40 UTCJul 11, 14:25 UTC45m
2026-07-11 DAL2664 BUF → ATL Jul 11, 10:10 UTCJul 11, 11:50 UTC1h 40m
2026-07-11 DAL2664 BUF → ATL Jul 11, 10:10 UTCJul 11, 11:46 UTC1h 36m
2026-07-11 DAL2334 ATL → BUF Jul 11, 04:25 UTCJul 11, 05:55 UTC1h 30m
2026-07-11 DAL2334 ATL → BUF Jul 11, 04:21 UTCJul 11, 05:51 UTC1h 30m
2026-07-11 DAL2627 - Jul 11, 01:05 UTCJul 11, 01:50 UTC45m
2026-07-10 DAL2627 - Jul 10, 22:30 UTCJul 10, 23:15 UTC45m
2026-07-10 DAL961 - Jul 10, 18:20 UTCJul 10, 20:45 UTC2h 25m
2026-07-10 DAL961 DFW → ATL Jul 10, 18:20 UTCJul 10, 20:41 UTC2h 21m
2026-07-10 DAL961 ATL → DFW Jul 10, 14:30 UTCJul 10, 16:10 UTC1h 40m
2026-07-10 DAL2429 - Jul 10, 10:10 UTCJul 10, 12:15 UTC2h 5m
2026-07-10 DAL2584 ATL → ALB Jul 10, 01:50 UTCJul 10, 03:45 UTC1h 55m
2026-07-10 DAL2584 ATL → ALB Jul 10, 01:50 UTCJul 10, 03:40 UTC1h 50m
2026-07-09 DAL1397 AUS → ATL Jul 9, 22:10 UTCJul 10, 00:00 UTC1h 50m
2026-07-09 DAL1397 ATL → AUS Jul 9, 18:35 UTCJul 9, 20:30 UTC1h 55m
2026-07-09 DAL839 DFW → ATL Jul 9, 15:25 UTCJul 9, 17:10 UTC1h 45m
2026-07-09 DAL839 ATL → DFW Jul 9, 11:55 UTCJul 9, 13:40 UTC1h 45m
2026-07-08 DAL1267 - Jul 8, 22:20 UTCJul 8, 23:40 UTC1h 20m
2026-07-08 DAL1267 ATL → BWI Jul 8, 19:35 UTCJul 8, 21:05 UTC1h 30m
2026-07-08 DAL1271 - Jul 8, 16:20 UTCJul 8, 17:40 UTC1h 20m
2026-07-08 DAL1271 ATL → FLL Jul 8, 13:15 UTCJul 8, 14:40 UTC1h 25m
2026-07-08 DAL2664 BUF → ATL Jul 8, 10:20 UTCJul 8, 11:50 UTC1h 30m
2026-07-08 DAL2334 ATL → BUF Jul 8, 02:20 UTCJul 8, 03:45 UTC1h 25m
2026-07-07 DAL1397 AUS → ATL Jul 7, 22:15 UTCJul 8, 00:20 UTC2h 5m
2026-07-07 DAL1397 ATL → AUS Jul 7, 18:35 UTCJul 7, 20:25 UTC1h 50m
2026-07-07 DAL1094 BOS → BNA Jul 7, 15:35 UTCJul 7, 16:55 UTC1h 20m
2026-07-07 DAL1094 BOS → BNA Jul 7, 15:31 UTCJul 7, 16:50 UTC1h 19m
2026-07-07 DAL1094 BOS → BNA Jul 7, 12:10 UTCJul 7, 13:40 UTC1h 30m
2026-07-06 DAL399 BOS → ATL Jul 6, 23:05 UTCJul 7, 01:20 UTC2h 15m
2026-07-06 DAL399 BOS → ATL Jul 6, 23:02 UTCJul 7, 01:14 UTC2h 12m
2026-07-06 DAL350 ATL → BOS Jul 6, 19:00 UTCJul 6, 21:15 UTC2h 15m
2026-07-06 DAL350 - Jul 6, 19:00 UTCJul 6, 20:45 UTC1h 45m
2026-07-06 DAL2899 RDU → BOS Jul 6, 13:35 UTCJul 6, 15:25 UTC1h 50m
2026-07-06 DAL1170 ATL → AUS Jul 6, 00:50 UTCJul 6, 02:40 UTC1h 50m
2026-07-05 DAL2063 JFK → DFW Jul 5, 20:35 UTCJul 5, 22:00 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 N361DN page for operator, model, and routing details .

Mode-S A4105B frequently asked

What is Mode-S code A4105B?
A4105B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N361DN.
Where is Mode-S A4105B registered?
Mode-S code A4105B 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 A4105B broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4105B, octal 51010133, decimal 10,752,091.
What flights does A4105B operate?
Mode-S A4105B has broadcast 20 distinct callsigns, including DAL961, DAL2078, DAL2266, DAL2264, DAL1815.