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
No current signal · last broadcast 6h ago
Flights observed
606
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S AC508B.

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
DAL3193 - 9 2026-06-22
DAL2157 Delta Air Lines 9 2026-05-22
DAL1787 Delta Air Lines 9 2026-06-03
DAL3048 Delta Air Lines 8 2026-05-24
DAL2684 Delta Air Lines 8 2026-06-01
DAL2417 - 8 2026-07-13
DAL2857 Delta Air Lines 7 2026-06-25
DAL2826 Delta Air Lines 7 2026-05-13
DAL2577 Delta Air Lines 7 2026-05-29
DAL2467 Delta Air Lines 7 2026-06-20
DAL2358 Delta Air Lines 7 2026-06-01
DAL2331 Delta Air Lines 7 2026-05-31
DAL1637 Delta Air Lines 7 2026-04-24
DAL854 Delta Air Lines 6 2026-05-18
DAL3195 - 6 2026-07-11
DAL2868 Delta Air Lines 6 2026-06-16
DAL2539 - 6 2026-06-26
DAL2364 Delta Air Lines 6 2026-05-08
DAL1743 - 6 2026-07-01
DAL1541 Delta Air Lines 6 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL1569 ATL → TLH Jul 14, 02:03 UTCJul 14, 02:40 UTC37m
2026-07-14 DAL1569 - Jul 14, 02:05 UTCJul 14, 02:40 UTC35m
2026-07-13 DAL1292 - Jul 13, 23:30 UTCJul 14, 00:40 UTC1h 10m
2026-07-13 DAL1292 - Jul 13, 21:00 UTCJul 13, 22:05 UTC1h 5m
2026-07-13 DAL2417 - Jul 13, 17:50 UTCJul 13, 19:30 UTC1h 40m
2026-07-13 DAL2417 - Jul 13, 15:15 UTCJul 13, 16:40 UTC1h 25m
2026-07-13 DAL1158 OKC → ATL Jul 13, 12:05 UTCJul 13, 13:45 UTC1h 40m
2026-07-12 DAL2784 ATL → OKC Jul 12, 23:55 UTCJul 13, 01:50 UTC1h 55m
2026-07-12 DAL940 SAV → ATL Jul 12, 20:10 UTCJul 12, 21:10 UTC1h 0m
2026-07-12 DAL940 SAV → ATL Jul 12, 20:10 UTCJul 12, 21:05 UTC55m
2026-07-12 DAL940 ATL → SAV Jul 12, 16:45 UTCJul 12, 17:30 UTC45m
2026-07-12 DAL1149 - Jul 12, 14:35 UTCJul 12, 15:25 UTC50m
2026-07-12 DAL2384 - Jul 12, 01:20 UTCJul 12, 02:25 UTC1h 5m
2026-07-11 DAL3195 - Jul 11, 23:00 UTCJul 12, 00:05 UTC1h 5m
2026-07-11 DAL3195 - Jul 11, 18:00 UTCJul 11, 19:15 UTC1h 15m
2026-07-11 DAL2952 - Jul 11, 15:35 UTCJul 11, 16:45 UTC1h 10m
2026-07-11 DAL2952 ATL → IND Jul 11, 13:15 UTCJul 11, 14:20 UTC1h 5m
2026-07-11 DAL1537 - Jul 11, 11:10 UTCJul 11, 11:45 UTC35m
2026-07-11 DAL1596 - Jul 11, 01:35 UTCJul 11, 02:15 UTC40m
2026-07-10 DAL1186 TUL → ATL Jul 10, 22:00 UTCJul 10, 23:30 UTC1h 30m
2026-07-10 DAL1186 TUL → ATL Jul 10, 22:00 UTCJul 10, 23:32 UTC1h 32m
2026-07-10 DAL1186 ATL → TUL Jul 10, 19:25 UTCJul 10, 21:00 UTC1h 35m
2026-07-10 DAL1017 - Jul 10, 17:35 UTCJul 10, 18:05 UTC30m
2026-07-10 DAL1017 - Jul 10, 15:30 UTCJul 10, 15:55 UTC25m
2026-07-10 DAL1369 ATL → GRR Jul 10, 12:30 UTCJul 10, 13:00 UTC30m
2026-07-10 DAL1369 ATL → GRR Jul 10, 12:25 UTCJul 10, 12:58 UTC33m
2026-07-10 DAL3202 - Jul 10, 02:40 UTCJul 10, 03:05 UTC25m
2026-07-09 DAL2153 - Jul 9, 22:25 UTCJul 9, 23:00 UTC35m
2026-07-09 DAL2153 CAE → ATL Jul 9, 22:20 UTCJul 9, 22:59 UTC39m
2026-07-09 DAL2153 - Jul 9, 20:45 UTCJul 9, 21:20 UTC35m
2026-07-09 DAL1182 - Jul 9, 18:10 UTCJul 9, 18:40 UTC30m
2026-07-09 DAL1182 - Jul 9, 16:25 UTCJul 9, 17:00 UTC35m
2026-07-09 DAL1010 - Jul 9, 14:10 UTCJul 9, 14:50 UTC40m
2026-07-09 DAL1010 - Jul 9, 12:30 UTCJul 9, 13:05 UTC35m
2026-07-09 DAL1044 - Jul 9, 09:45 UTCJul 9, 10:10 UTC25m
2026-07-09 DAL1044 CHA → ATL Jul 9, 09:40 UTCJul 9, 10:08 UTC28m
2026-07-08 DAL3150 ATL → CHA Jul 8, 22:45 UTCJul 8, 23:10 UTC25m
2026-07-08 DAL1060 - Jul 8, 19:05 UTCJul 8, 20:55 UTC1h 50m
2026-07-08 DAL1060 ICT → ATL Jul 8, 19:00 UTCJul 8, 20:50 UTC1h 50m
2026-07-08 DAL1060 ATL → ICT Jul 8, 15:55 UTCJul 8, 17:40 UTC1h 45m
2026-07-08 DAL1618 - Jul 8, 11:35 UTCJul 8, 12:10 UTC35m
2026-07-08 DAL3202 - Jul 8, 00:15 UTCJul 8, 00:45 UTC30m
2026-07-05 DAL3018 - Jul 5, 09:35 UTCJul 5, 10:25 UTC50m
2026-07-05 DAL3005 - Jul 5, 03:00 UTCJul 5, 03:45 UTC45m
2026-07-05 DAL3005 ATL → GSO Jul 5, 02:58 UTCJul 5, 03:47 UTC49m
2026-07-05 DAL3143 - Jul 5, 01:40 UTCJul 5, 02:00 UTC20m
2026-07-05 DAL3143 CHA → ATL Jul 5, 01:36 UTCJul 5, 01:58 UTC22m
2026-07-04 DAL3143 - Jul 4, 21:55 UTCJul 4, 23:30 UTC1h 35m
2026-07-04 DAL3143 ATL → LEX Jul 4, 20:00 UTCJul 4, 20:50 UTC50m
2026-07-04 DAL1444 IAD → ATL Jul 4, 17:00 UTCJul 4, 18:15 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 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?
No active broadcast right now. Last signal was 6h ago.
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 DAL3193, DAL2157, DAL1787, DAL3048, DAL2684.