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
Broadcasting now · callsign DAL2684 · 5,775 ft
Flights observed
656
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:35 UTC

Current position

AD273B is currently broadcasting. Map zoomed to live position.

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
DAL3030 Delta Air Lines 10 2026-07-25
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
DAL3045 - 7 2026-07-22
DAL2868 - 7 2026-07-08
DAL2778 Delta Air Lines 7 2026-05-05
DAL2599 Delta Air Lines 7 2026-07-22
DAL2250 - 7 2026-07-16
DAL1681 - 7 2026-06-19
DAL3182 - 6 2026-07-14
DAL3143 - 6 2026-06-13
DAL3118 - 6 2026-06-19
DAL3042 - 6 2026-06-27
DAL3027 - 6 2026-07-16
DAL2216 Delta Air Lines 6 2026-07-22
DAL1708 Delta Air Lines 6 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2182 SFO → DTW Jul 26, 22:05 UTCJul 26, 22:35 UTC30m
2026-07-26 DAL1060 ATL → COS Jul 26, 18:55 UTCJul 26, 20:40 UTC1h 45m
2026-07-26 DAL1060 ATL → COS Jul 26, 15:55 UTCJul 26, 17:40 UTC1h 45m
2026-07-26 DAL3036 HSV → ATL Jul 26, 13:55 UTCJul 26, 14:25 UTC30m
2026-07-26 DAL3036 HSV → ATL Jul 26, 12:10 UTCJul 26, 12:45 UTC35m
2026-07-26 DAL1537 SEA → CVG Jul 26, 10:10 UTCJul 26, 10:45 UTC35m
2026-07-26 DAL1596 MSP → ATL Jul 26, 01:52 UTCJul 26, 02:34 UTC42m
2026-07-26 DAL1596 MSP → ATL Jul 26, 01:55 UTCJul 26, 02:30 UTC35m
2026-07-25 DAL2128 ATL → ICT Jul 25, 22:10 UTCJul 25, 23:55 UTC1h 45m
2026-07-25 DAL2128 ATL → ICT Jul 25, 22:09 UTCJul 25, 23:50 UTC1h 41m
2026-07-25 DAL2128 ATL → ICT Jul 25, 19:20 UTCJul 25, 21:05 UTC1h 45m
2026-07-25 DAL3030 GNV → ATL Jul 25, 17:10 UTCJul 25, 18:00 UTC50m
2026-07-25 DAL3030 GNV → ATL Jul 25, 15:15 UTCJul 25, 16:00 UTC45m
2026-07-25 DAL2853 JAX → DTW Jul 25, 13:35 UTCJul 25, 14:10 UTC35m
2026-07-25 DAL3071 ATL → AVL Jul 25, 12:00 UTCJul 25, 12:30 UTC30m
2026-07-25 DAL3026 ATL → HSV Jul 25, 00:40 UTCJul 25, 01:15 UTC35m
2026-07-25 DAL3026 ATL → HSV Jul 25, 00:38 UTCJul 25, 01:11 UTC33m
2026-07-24 DAL3026 ATL → HSV Jul 24, 22:45 UTCJul 24, 23:25 UTC40m
2026-07-23 DAL1565 - Jul 23, 10:40 UTCJul 23, 11:45 UTC1h 5m
2026-07-23 DAL1565 LIT → ATL Jul 23, 10:33 UTCJul 23, 11:40 UTC1h 7m
2026-07-23 DAL2701 ATL → LIT Jul 23, 01:05 UTCJul 23, 02:00 UTC55m
2026-07-22 DAL2599 ATL → MSN Jul 22, 22:05 UTCJul 22, 23:35 UTC1h 30m
2026-07-22 DAL2599 ATL → MSN Jul 22, 22:01 UTCJul 22, 23:32 UTC1h 31m
2026-07-22 DAL2599 ATL → MSN Jul 22, 18:55 UTCJul 22, 20:30 UTC1h 35m
2026-07-22 DAL3045 - Jul 22, 16:50 UTCJul 22, 17:35 UTC45m
2026-07-22 DAL3045 ECP → ATL Jul 22, 16:47 UTCJul 22, 17:35 UTC48m
2026-07-22 DAL3045 - Jul 22, 14:50 UTCJul 22, 15:55 UTC1h 5m
2026-07-22 DAL2216 DTW → SFO Jul 22, 11:10 UTCJul 22, 12:35 UTC1h 25m
2026-07-22 DAL2959 ATL → ICT Jul 22, 00:55 UTCJul 22, 02:35 UTC1h 40m
2026-07-21 DAL512 DAL → ATL Jul 21, 21:05 UTCJul 21, 22:40 UTC1h 35m
2026-07-21 DAL512 DAL → ATL Jul 21, 18:10 UTCJul 21, 19:55 UTC1h 45m
2026-07-21 DAL2754 HSV → ATL Jul 21, 15:15 UTCJul 21, 16:45 UTC1h 30m
2026-07-21 DAL2754 HSV → ATL Jul 21, 12:30 UTCJul 21, 14:05 UTC1h 35m
2026-07-21 DAL2556 MSP → SFO Jul 21, 10:35 UTCJul 21, 11:05 UTC30m
2026-07-21 DAL3022 ATL → HSV Jul 21, 03:10 UTCJul 21, 03:45 UTC35m
2026-07-21 DAL3022 ATL → HSV Jul 21, 03:09 UTCJul 21, 03:41 UTC32m
2026-07-21 DAL1093 - Jul 21, 00:05 UTCJul 21, 00:50 UTC45m
2026-07-20 DAL1093 - Jul 20, 21:55 UTCJul 20, 22:35 UTC40m
2026-07-20 DAL2157 - Jul 20, 19:40 UTCJul 20, 20:20 UTC40m
2026-07-20 DAL2157 CLT → ATL Jul 20, 19:36 UTCJul 20, 20:16 UTC40m
2026-07-20 DAL2157 - Jul 20, 17:25 UTCJul 20, 18:10 UTC45m
2026-07-19 DAL304 - Jul 19, 20:45 UTCJul 19, 21:30 UTC45m
2026-07-19 DAL304 - Jul 19, 17:20 UTCJul 19, 19:25 UTC2h 5m
2026-07-19 DAL304 ATL → ABE Jul 19, 14:30 UTCJul 19, 16:05 UTC1h 35m
2026-07-19 DAL3009 - Jul 19, 12:15 UTCJul 19, 12:45 UTC30m
2026-07-18 DAL3171 ATL → HSV Jul 18, 22:35 UTCJul 18, 23:20 UTC45m
2026-07-18 DAL3141 - Jul 18, 19:45 UTCJul 18, 20:15 UTC30m
2026-07-18 DAL3141 CHA → ATL Jul 18, 19:44 UTCJul 18, 20:13 UTC29m
2026-07-18 DAL3141 - Jul 18, 18:15 UTCJul 18, 18:40 UTC25m
2026-07-18 DAL3108 - Jul 18, 15:25 UTCJul 18, 16:40 UTC1h 15m

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?
Yes. Mode-S AD273B is currently airborne.
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, DAL3030, DAL1704, DAL2857, DAL2563.