Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AD273B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N947AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
AD273B
Octal
53223473
Decimal
11,347,771
Country
US
Tail
N947AT
Type
B712
No current signal · last broadcast 3h ago
Flights observed
572
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S AD273B.

Country allocation

The ICAO 24-bit address AD273B 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
DAL3032 - 10 2026-07-01
DAL1704 Delta Air Lines 9 2026-06-10
DAL2857 - 8 2026-07-12
DAL2563 Delta Air Lines 8 2026-05-15
DAL1286 - 8 2026-07-02
DAL3068 - 7 2026-07-09
DAL2868 - 7 2026-07-08
DAL2778 Delta Air Lines 7 2026-05-05
DAL1681 - 7 2026-06-19
DAL3143 - 6 2026-06-13
DAL3118 - 6 2026-06-19
DAL3042 - 6 2026-06-27
DAL3030 - 6 2026-06-20
DAL1708 Delta Air Lines 6 2026-07-04
DAL1616 - 6 2026-07-10
DAL940 Delta Air Lines 5 2026-06-16
DAL441 - 5 2026-07-06
DAL3052 Delta Air Lines 5 2026-06-11
DAL3050 Delta Air Lines 5 2026-06-25
DAL2216 Delta Air Lines 5 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2034 - Jul 14, 03:15 UTCJul 14, 03:40 UTC25m
2026-07-14 DAL2128 - Jul 14, 00:15 UTCJul 14, 01:55 UTC1h 40m
2026-07-13 DAL2128 ATL → ICT Jul 13, 21:30 UTCJul 13, 23:15 UTC1h 45m
2026-07-13 DAL2179 - Jul 13, 19:35 UTCJul 13, 20:25 UTC50m
2026-07-13 DAL2179 - Jul 13, 16:45 UTCJul 13, 17:35 UTC50m
2026-07-13 DAL1149 - Jul 13, 14:35 UTCJul 13, 15:30 UTC55m
2026-07-13 DAL2001 ATL → MEM Jul 13, 01:31 UTCJul 13, 02:34 UTC1h 3m
2026-07-13 DAL2001 - Jul 13, 01:35 UTCJul 13, 02:35 UTC1h 0m
2026-07-12 DAL2763 - Jul 12, 20:45 UTCJul 12, 22:20 UTC1h 35m
2026-07-12 DAL2763 ATL → DAY Jul 12, 17:35 UTCJul 12, 18:40 UTC1h 5m
2026-07-12 DAL1374 - Jul 12, 15:25 UTCJul 12, 16:20 UTC55m
2026-07-12 DAL1374 SDF → ATL Jul 12, 15:21 UTCJul 12, 16:15 UTC54m
2026-07-12 DAL1374 - Jul 12, 13:20 UTCJul 12, 14:20 UTC1h 0m
2026-07-12 DAL2857 - Jul 12, 00:40 UTCJul 12, 02:10 UTC1h 30m
2026-07-12 DAL2857 MDT → ATL Jul 12, 00:39 UTCJul 12, 02:07 UTC1h 28m
2026-07-11 DAL2857 - Jul 11, 20:00 UTCJul 11, 21:40 UTC1h 40m
2026-07-11 DAL1619 - Jul 11, 16:10 UTCJul 11, 16:50 UTC40m
2026-07-11 DAL3136 - Jul 11, 03:30 UTCJul 11, 04:05 UTC35m
2026-07-11 DAL2878 - Jul 11, 00:25 UTCJul 11, 01:15 UTC50m
2026-07-10 DAL2878 - Jul 10, 22:25 UTCJul 10, 23:05 UTC40m
2026-07-10 DAL3012 - Jul 10, 19:30 UTCJul 10, 20:30 UTC1h 0m
2026-07-10 DAL3012 - Jul 10, 17:35 UTCJul 10, 18:05 UTC30m
2026-07-10 DAL2158 - Jul 10, 15:55 UTCJul 10, 16:30 UTC35m
2026-07-10 DAL2158 - Jul 10, 14:05 UTCJul 10, 14:40 UTC35m
2026-07-10 DAL2379 - Jul 10, 10:35 UTCJul 10, 12:20 UTC1h 45m
2026-07-10 DAL1616 - Jul 10, 02:15 UTCJul 10, 02:25 UTC10m
2026-07-10 DAL1616 - Jul 10, 00:30 UTCJul 10, 02:10 UTC1h 40m
2026-07-10 DAL1616 ATL → HPN Jul 10, 00:30 UTCJul 10, 02:24 UTC1h 54m
2026-07-09 DAL3026 - Jul 9, 22:45 UTCJul 9, 23:15 UTC30m
2026-07-09 DAL3026 ATL → HSV Jul 9, 20:35 UTCJul 9, 21:05 UTC30m
2026-07-09 DAL3068 HSV → ATL Jul 9, 18:05 UTCJul 9, 18:40 UTC35m
2026-07-09 DAL3068 HSV → ATL Jul 9, 18:04 UTCJul 9, 18:43 UTC39m
2026-07-09 DAL3068 ATL → HSV Jul 9, 15:55 UTCJul 9, 16:30 UTC35m
2026-07-09 DAL3089 - Jul 9, 14:10 UTCJul 9, 14:40 UTC30m
2026-07-09 DAL3089 - Jul 9, 12:35 UTCJul 9, 13:05 UTC30m
2026-07-09 DAL1979 - Jul 9, 10:20 UTCJul 9, 10:55 UTC35m
2026-07-08 DAL3145 - Jul 8, 23:55 UTCJul 9, 01:20 UTC1h 25m
2026-07-08 DAL1821 - Jul 8, 21:00 UTCJul 8, 22:30 UTC1h 30m
2026-07-08 DAL1821 - Jul 8, 18:10 UTCJul 8, 19:35 UTC1h 25m
2026-07-08 DAL2868 STL → DTW Jul 8, 15:20 UTCJul 8, 16:25 UTC1h 5m
2026-07-08 DAL2868 STL → DTW Jul 8, 15:19 UTCJul 8, 16:22 UTC1h 3m
2026-07-08 DAL2868 - Jul 8, 13:15 UTCJul 8, 14:15 UTC1h 0m
2026-07-08 DAL2601 - Jul 8, 10:15 UTCJul 8, 11:20 UTC1h 5m
2026-07-08 DAL2601 BWI → DTW Jul 8, 10:13 UTCJul 8, 11:19 UTC1h 6m
2026-07-08 DAL2715 - Jul 8, 02:10 UTCJul 8, 03:15 UTC1h 5m
2026-07-07 DAL2573 EWR → DTW Jul 7, 21:00 UTCJul 7, 22:15 UTC1h 15m
2026-07-07 DAL2573 EWR → DTW Jul 7, 20:58 UTCJul 7, 22:13 UTC1h 15m
2026-07-07 DAL2573 - Jul 7, 18:30 UTCJul 7, 19:45 UTC1h 15m
2026-07-07 DAL3137 ATL → CLT Jul 7, 15:40 UTCJul 7, 17:00 UTC1h 20m
2026-07-07 DAL3137 ATL → CLT Jul 7, 13:05 UTCJul 7, 14:35 UTC1h 30m

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 N947AT page for operator, model, and routing details .

Mode-S AD273B frequently asked

What is Mode-S code AD273B?
AD273B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N947AT.
Where is Mode-S AD273B registered?
Mode-S code AD273B 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 AD273B 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 AD273B, octal 53223473, decimal 11,347,771.
What flights does AD273B operate?
Mode-S AD273B has broadcast 20 distinct callsigns, including DAL3032, DAL1704, DAL2857, DAL2563, DAL1286.