Apparatus

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sensors Mode-S transponder

AC508B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N893AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
AC508B
Octal
53050213
Decimal
11,292,811
Country
US
Tail
N893AT
Type
B712
Broadcasting now · callsign DAL731 · 8,875 ft
Flights observed
694
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Current position

AC508B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC508B 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
DAL2331 - 10 2026-07-16
DAL3193 - 9 2026-06-22
DAL2577 - 9 2026-07-15
DAL2157 Delta Air Lines 9 2026-05-22
DAL1787 Delta Air Lines 9 2026-06-03
DAL3048 Delta Air Lines 8 2026-05-24
DAL2868 Delta Air Lines 8 2026-07-24
DAL2684 Delta Air Lines 8 2026-06-01
DAL2539 Delta Air Lines 8 2026-07-25
DAL2417 - 8 2026-07-13
DAL1149 - 8 2026-07-17
DAL2857 Delta Air Lines 7 2026-06-25
DAL2826 Delta Air Lines 7 2026-05-13
DAL2467 Delta Air Lines 7 2026-06-20
DAL2358 Delta Air Lines 7 2026-06-01
DAL1637 Delta Air Lines 7 2026-04-24
DAL1549 - 7 2026-07-18
DAL1546 Delta Air Lines 7 2026-07-22
DAL854 Delta Air Lines 6 2026-05-18
DAL3195 - 6 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1604 JFK → SAN Jul 26, 22:20 UTCJul 26, 22:45 UTC25m
2026-07-26 DAL2832 DTW → JFK Jul 26, 20:10 UTCJul 26, 20:55 UTC45m
2026-07-26 DAL2832 DTW → JFK Jul 26, 18:15 UTCJul 26, 18:50 UTC35m
2026-07-26 DAL3108 ATL → DAY Jul 26, 15:30 UTCJul 26, 16:40 UTC1h 10m
2026-07-26 DAL3108 ATL → DAY Jul 26, 15:26 UTCJul 26, 16:35 UTC1h 9m
2026-07-26 DAL3108 ATL → DAY Jul 26, 13:15 UTCJul 26, 14:20 UTC1h 5m
2026-07-26 DAL3041 JAN → ATL Jul 26, 10:45 UTCJul 26, 11:40 UTC55m
2026-07-25 DAL3180 JAN → ATL Jul 25, 22:40 UTCJul 25, 23:35 UTC55m
2026-07-25 DAL2539 FLL → CVG Jul 25, 20:25 UTCJul 25, 21:15 UTC50m
2026-07-25 DAL2539 FLL → CVG Jul 25, 18:25 UTCJul 25, 19:10 UTC45m
2026-07-25 DAL1286 - Jul 25, 16:05 UTCJul 25, 16:55 UTC50m
2026-07-25 DAL1286 - Jul 25, 13:30 UTCJul 25, 14:05 UTC35m
2026-07-25 DAL3041 JAN → ATL Jul 25, 11:25 UTCJul 25, 12:15 UTC50m
2026-07-25 DAL3084 ATL → JAN Jul 25, 00:45 UTCJul 25, 01:25 UTC40m
2026-07-24 DAL3032 ATL → CAE Jul 24, 22:05 UTCJul 24, 22:55 UTC50m
2026-07-24 DAL3032 ATL → CAE Jul 24, 21:59 UTCJul 24, 22:59 UTC1h 0m
2026-07-24 DAL1429 BOS → RSW Jul 24, 18:20 UTCJul 24, 19:40 UTC1h 20m
2026-07-24 DAL2868 ATL → SDF Jul 24, 15:30 UTCJul 24, 16:35 UTC1h 5m
2026-07-24 DAL2868 ATL → SDF Jul 24, 13:10 UTCJul 24, 14:20 UTC1h 10m
2026-07-24 DAL2601 BWI → DTW Jul 24, 10:20 UTCJul 24, 11:25 UTC1h 5m
2026-07-24 DAL2715 DTW → BWI Jul 24, 01:55 UTCJul 24, 03:00 UTC1h 5m
2026-07-24 DAL2715 DTW → BWI Jul 24, 01:52 UTCJul 24, 02:53 UTC1h 1m
2026-07-23 DAL2573 PHL → ATL Jul 23, 21:20 UTCJul 23, 22:35 UTC1h 15m
2026-07-23 DAL2573 PHL → ATL Jul 23, 18:45 UTCJul 23, 20:00 UTC1h 15m
2026-07-23 DAL3137 ATL → CLT Jul 23, 15:40 UTCJul 23, 17:00 UTC1h 20m
2026-07-23 DAL3137 ATL → CLT Jul 23, 12:55 UTCJul 23, 14:20 UTC1h 25m
2026-07-23 DAL1405 LGA → MCO Jul 23, 10:15 UTCJul 23, 11:30 UTC1h 15m
2026-07-23 DAL2352 DTW → CLT Jul 23, 00:30 UTCJul 23, 01:50 UTC1h 20m
2026-07-22 DAL1391 EWR → DTW Jul 22, 21:50 UTCJul 22, 23:05 UTC1h 15m
2026-07-22 DAL1391 EWR → DTW Jul 22, 19:30 UTCJul 22, 20:45 UTC1h 15m
2026-07-22 DAL1546 LAS → MSP Jul 22, 16:55 UTCJul 22, 17:55 UTC1h 0m
2026-07-22 DAL1546 LAS → MSP Jul 22, 14:25 UTCJul 22, 15:25 UTC1h 0m
2026-07-22 DAL2039 ORD → DTW Jul 22, 12:25 UTCJul 22, 13:15 UTC50m
2026-07-22 DAL1665 SLC → DFW Jul 22, 02:10 UTCJul 22, 03:05 UTC55m
2026-07-21 DAL1546 LAS → MSP Jul 21, 16:55 UTCJul 21, 18:30 UTC1h 35m
2026-07-21 DAL1546 LAS → MSP Jul 21, 16:54 UTCJul 21, 18:29 UTC1h 35m
2026-07-21 DAL1546 LAS → MSP Jul 21, 14:35 UTCJul 21, 16:00 UTC1h 25m
2026-07-21 DAL3006 RSW → DTW Jul 21, 11:25 UTCJul 21, 13:00 UTC1h 35m
2026-07-21 DAL3006 RSW → DTW Jul 21, 11:23 UTCJul 21, 12:59 UTC1h 36m
2026-07-21 DAL2257 PHX → JFK Jul 21, 02:00 UTCJul 21, 02:25 UTC25m
2026-07-21 DAL3042 ATL → TYS Jul 21, 00:00 UTCJul 21, 00:25 UTC25m
2026-07-20 DAL3042 ATL → TYS Jul 20, 22:00 UTCJul 20, 22:30 UTC30m
2026-07-20 DAL2823 SLC → SEA Jul 20, 20:00 UTCJul 20, 20:50 UTC50m
2026-07-20 DAL2823 SLC → SEA Jul 20, 17:50 UTCJul 20, 18:30 UTC40m
2026-07-20 DAL1155 - Jul 20, 16:00 UTCJul 20, 16:40 UTC40m
2026-07-20 DAL1155 ATL → BNA Jul 20, 14:10 UTCJul 20, 14:50 UTC40m
2026-07-20 DAL2216 DTW → SFO Jul 20, 10:55 UTCJul 20, 12:45 UTC1h 50m
2026-07-20 DAL2959 ATL → ICT Jul 20, 01:30 UTCJul 20, 03:20 UTC1h 50m
2026-07-19 DAL3057 CHA → ATL Jul 19, 21:14 UTCJul 19, 21:52 UTC38m
2026-07-19 DAL3057 - Jul 19, 19:30 UTCJul 19, 19:50 UTC20m

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 N893AT page for operator, model, and routing details .

Mode-S AC508B frequently asked

What is Mode-S code AC508B?
AC508B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N893AT.
Where is Mode-S AC508B registered?
Mode-S code AC508B 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 AC508B broadcasting right now?
Yes. Mode-S AC508B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC508B, octal 53050213, decimal 11,292,811.
What flights does AC508B operate?
Mode-S AC508B has broadcast 20 distinct callsigns, including DAL2331, DAL3193, DAL2577, DAL2157, DAL1787.