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 Jul 26, 22:15 UTC
Flights observed
549
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

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 - 16 2026-07-20
DAL2264 Delta Air Lines 9 2026-07-23
DAL1295 - 9 2026-07-20
DAL2078 Delta Air Lines 8 2026-05-13
DAL2266 - 7 2026-07-11
DAL1815 Delta Air Lines 7 2026-06-20
DAL1512 Delta Air Lines 7 2026-05-31
DAL959 Delta Air Lines 6 2026-07-20
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
DAL2720 - 5 2026-07-18
DAL2350 Delta Air Lines 5 2026-06-21
DAL2325 Delta Air Lines 5 2026-06-09
DAL2322 - 5 2026-07-17
DAL2312 - 5 2026-07-01
DAL2270 Delta Air Lines 5 2026-05-25
DAL1348 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL374 SFO → BOS Jul 26, 20:20 UTCJul 26, 22:05 UTC1h 45m
2026-07-26 DAL1153 BOS → DFW Jul 26, 17:25 UTCJul 26, 18:45 UTC1h 20m
2026-07-26 DAL1153 BOS → DFW Jul 26, 14:50 UTCJul 26, 16:05 UTC1h 15m
2026-07-26 DAL1515 JFK → MCO Jul 26, 10:10 UTCJul 26, 12:30 UTC2h 20m
2026-07-26 DAL2138 ATL → PWM Jul 26, 01:50 UTCJul 26, 04:00 UTC2h 10m
2026-07-25 DAL1028 GEG → EWR Jul 25, 21:15 UTCJul 25, 23:05 UTC1h 50m
2026-07-25 DAL2901 ATL → MSP Jul 25, 16:30 UTCJul 25, 18:45 UTC2h 15m
2026-07-25 DAL2709 - Jul 25, 13:15 UTCJul 25, 14:50 UTC1h 35m
2026-07-25 DAL1284 ATL → IAH Jul 25, 02:10 UTCJul 25, 03:40 UTC1h 30m
2026-07-24 DAL1028 GEG → EWR Jul 24, 22:35 UTCJul 25, 00:35 UTC2h 0m
2026-07-24 DAL2301 MCO → BOS Jul 24, 16:35 UTCJul 24, 19:35 UTC3h 0m
2026-07-24 DAL2301 MCO → BOS Jul 24, 12:45 UTCJul 24, 15:25 UTC2h 40m
2026-07-23 DAL2264 BOS → ATL Jul 23, 22:50 UTCJul 24, 02:00 UTC3h 10m
2026-07-23 DAL2264 BOS → ATL Jul 23, 18:40 UTCJul 23, 21:15 UTC2h 35m
2026-07-23 DAL2724 DAY → ATL Jul 23, 15:25 UTCJul 23, 17:15 UTC1h 50m
2026-07-23 DAL2724 DAY → ATL Jul 23, 12:00 UTCJul 23, 13:35 UTC1h 35m
2026-07-22 DAL1127 BOS → MSP Jul 22, 21:55 UTCJul 23, 00:40 UTC2h 45m
2026-07-22 DAL862 ATL → BOS Jul 22, 17:30 UTCJul 22, 19:35 UTC2h 5m
2026-07-22 DAL1236 - Jul 22, 12:15 UTCJul 22, 13:45 UTC1h 30m
2026-07-22 DAL1236 MKE → ATL Jul 22, 12:12 UTCJul 22, 13:48 UTC1h 36m
2026-07-22 DAL1268 ATL → AVL Jul 22, 04:05 UTCJul 22, 05:25 UTC1h 20m
2026-07-22 DAL2401 EWR → ATL Jul 22, 00:05 UTCJul 22, 02:10 UTC2h 5m
2026-07-21 DAL2401 ATL → EWR Jul 21, 14:25 UTCJul 21, 16:15 UTC1h 50m
2026-07-21 DAL1352 - Jul 21, 11:10 UTCJul 21, 12:35 UTC1h 25m
2026-07-20 DAL959 DEN → ATL Jul 20, 21:40 UTCJul 20, 23:05 UTC1h 25m
2026-07-20 DAL961 DFW → ATL Jul 20, 18:20 UTCJul 20, 20:05 UTC1h 45m
2026-07-20 DAL961 DFW → ATL Jul 20, 18:18 UTCJul 20, 20:00 UTC1h 42m
2026-07-20 DAL961 ATL → DFW Jul 20, 14:05 UTCJul 20, 15:50 UTC1h 45m
2026-07-20 DAL1344 AUS → ATL Jul 20, 10:40 UTCJul 20, 12:30 UTC1h 50m
2026-07-20 DAL1335 ATL → AUS Jul 20, 04:20 UTCJul 20, 06:05 UTC1h 45m
2026-07-20 DAL1295 FLL → ATL Jul 20, 01:30 UTCJul 20, 02:55 UTC1h 25m
2026-07-19 DAL1295 ATL → FLL Jul 19, 22:35 UTCJul 20, 00:05 UTC1h 30m
2026-07-19 DAL1099 TPA → ATL Jul 19, 19:40 UTCJul 19, 20:45 UTC1h 5m
2026-07-19 DAL1099 - Jul 19, 15:30 UTCJul 19, 16:35 UTC1h 5m
2026-07-19 DAL1315 ATL → CLE Jul 19, 12:15 UTCJul 19, 13:45 UTC1h 30m
2026-07-19 DAL1284 ATL → IAH Jul 19, 00:20 UTCJul 19, 01:55 UTC1h 35m
2026-07-18 DAL2720 - Jul 18, 21:50 UTCJul 18, 22:35 UTC45m
2026-07-18 DAL2720 - Jul 18, 19:35 UTCJul 18, 20:25 UTC50m
2026-07-18 DAL839 DFW → ATL Jul 18, 16:00 UTCJul 18, 17:55 UTC1h 55m
2026-07-18 DAL839 ATL → DFW Jul 18, 12:25 UTCJul 18, 14:10 UTC1h 45m
2026-07-18 DAL2892 OMA → ATL Jul 18, 05:15 UTCJul 18, 09:10 UTC3h 55m
2026-07-18 DAL2892 OMA → ATL Jul 18, 05:13 UTCJul 18, 09:05 UTC3h 52m
2026-07-17 DAL2891 - Jul 17, 21:55 UTCJul 18, 01:54 UTC4h 0m
2026-07-17 DAL1190 - Jul 17, 18:10 UTCJul 17, 19:30 UTC1h 20m
2026-07-17 DAL1190 ATL → PBI Jul 17, 15:15 UTCJul 17, 16:29 UTC1h 15m
2026-07-17 DAL1236 - Jul 17, 12:10 UTCJul 17, 13:45 UTC1h 35m
2026-07-17 DAL1268 ATL → MKE Jul 17, 03:34 UTCJul 17, 05:04 UTC1h 30m
2026-07-17 DAL1268 ATL → MKE Jul 17, 03:31 UTCJul 17, 04:59 UTC1h 28m
2026-07-17 DAL2322 - Jul 17, 01:29 UTCJul 17, 02:05 UTC35m
2026-07-16 DAL2322 - Jul 16, 21:05 UTCJul 16, 23:29 UTC2h 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 Jul 26, 22:15 UTC.
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, DAL2264, DAL1295, DAL2078, DAL2266.