Apparatus

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sensors Mode-S transponder

AC8217

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N905DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AC8217
Octal
53101027
Decimal
11,305,495
Country
US
Tail
N905DN
Type
B739
Broadcasting now · callsign DAL1741 · 35,000 ft
Flights observed
459
Distinct callsigns
20
Country
US
Last broadcast
10h ago

Current position

AC8217 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC8217 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
DAL2022 Delta Air Lines 9 2026-06-05
DAL637 Delta Air Lines 7 2026-05-12
DAL3169 - 6 2026-07-06
DAL2829 Delta Air Lines 6 2026-04-17
DAL1188 - 6 2026-07-08
DAL2437 Delta Air Lines 5 2026-06-12
DAL1699 - 5 2026-07-02
DAL1660 Delta Air Lines 5 2026-06-30
DAL866 Delta Air Lines 4 2026-04-17
DAL858 Delta Air Lines 4 2026-06-10
DAL769 Delta Air Lines 4 2026-06-08
DAL728 - 4 2026-06-22
DAL2978 - 4 2026-06-29
DAL2205 - 4 2026-07-11
DAL2137 - 4 2026-07-08
DAL2027 - 4 2026-04-13
DAL1599 Delta Air Lines 4 2026-05-25
DAL1496 - 4 2026-07-09
DAL1447 - 4 2026-06-27
DAL1009 Delta Air Lines 4 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL1713 - Jul 14, 00:55 UTCJul 14, 03:20 UTC2h 25m
2026-07-13 DAL1480 JFK → ATL Jul 13, 20:10 UTCJul 13, 22:00 UTC1h 50m
2026-07-13 DAL1520 - Jul 13, 15:40 UTCJul 13, 18:00 UTC2h 20m
2026-07-13 DAL2347 LGA → MIA Jul 13, 11:25 UTCJul 13, 13:50 UTC2h 25m
2026-07-13 DAL2733 MSP → LGA Jul 13, 01:25 UTCJul 13, 03:45 UTC2h 20m
2026-07-12 DAL1701 SMF → MSP Jul 12, 20:35 UTCJul 12, 23:35 UTC3h 0m
2026-07-12 DAL1701 SMF → MSP Jul 12, 20:32 UTCJul 12, 23:30 UTC2h 58m
2026-07-12 DAL1701 MSP → SMF Jul 12, 15:40 UTCJul 12, 18:50 UTC3h 10m
2026-07-12 DAL1678 SLC → MSP Jul 12, 02:50 UTCJul 12, 13:55 UTC11h 5m
2026-07-11 DAL2205 BNA → SLC Jul 11, 22:35 UTCJul 12, 01:40 UTC3h 5m
2026-07-11 DAL2843 MSP → BNA Jul 11, 18:00 UTCJul 11, 19:35 UTC1h 35m
2026-07-11 DAL1615 GEG → MSP Jul 11, 14:05 UTCJul 11, 16:25 UTC2h 20m
2026-07-11 DAL2418 MSP → GEG Jul 11, 03:25 UTCJul 11, 06:01 UTC2h 35m
2026-07-10 DAL402 RSW → MSP Jul 10, 22:30 UTCJul 11, 01:50 UTC3h 20m
2026-07-10 DAL402 RSW → MSP Jul 10, 22:30 UTCJul 11, 01:50 UTC3h 20m
2026-07-10 DAL402 MSP → RSW Jul 10, 18:00 UTCJul 10, 21:25 UTC3h 25m
2026-07-10 DAL2916 - Jul 10, 14:10 UTCJul 10, 16:10 UTC2h 0m
2026-07-10 DAL2916 SLC → MSP Jul 10, 14:06 UTCJul 10, 16:09 UTC2h 3m
2026-07-10 DAL2652 OAK → SLC Jul 10, 04:15 UTCJul 10, 05:30 UTC1h 15m
2026-07-10 DAL2652 SFO → SLC Jul 10, 04:12 UTCJul 10, 05:31 UTC1h 19m
2026-07-09 DAL442 - Jul 9, 20:45 UTCJul 10, 01:25 UTC4h 40m
2026-07-09 DAL442 DTW → SFO Jul 9, 20:40 UTCJul 10, 01:23 UTC4h 43m
2026-07-09 DAL2236 SLC → DTW Jul 9, 16:05 UTCJul 9, 19:10 UTC3h 5m
2026-07-09 DAL1535 PHX → SLC Jul 9, 13:15 UTCJul 9, 14:30 UTC1h 15m
2026-07-09 DAL1496 SLC → PHX Jul 9, 05:45 UTCJul 9, 07:00 UTC1h 15m
2026-07-08 DAL1188 - Jul 8, 21:50 UTCJul 9, 01:30 UTC3h 40m
2026-07-08 DAL1188 - Jul 8, 16:55 UTCJul 8, 20:10 UTC3h 15m
2026-07-08 DAL2137 - Jul 8, 12:10 UTCJul 8, 15:10 UTC3h 0m
2026-07-08 DAL2657 ATL → IND Jul 8, 03:20 UTCJul 8, 04:25 UTC1h 5m
2026-07-07 DAL937 MCI → BOS Jul 7, 20:50 UTCJul 8, 00:10 UTC3h 20m
2026-07-07 DAL937 MCI → BOS Jul 7, 16:10 UTCJul 7, 19:15 UTC3h 5m
2026-07-07 DAL1074 MSP → LGA Jul 7, 12:05 UTCJul 7, 14:35 UTC2h 30m
2026-07-07 DAL1074 MSP → LGA Jul 7, 12:05 UTCJul 7, 14:30 UTC2h 25m
2026-07-07 DAL971 ATL → COS Jul 7, 02:05 UTCJul 7, 04:40 UTC2h 35m
2026-07-06 DAL1002 - Jul 6, 20:50 UTCJul 6, 23:20 UTC2h 30m
2026-07-06 DAL1002 - Jul 6, 16:25 UTCJul 6, 18:50 UTC2h 25m
2026-07-06 DAL1741 - Jul 6, 12:20 UTCJul 6, 14:50 UTC2h 30m
2026-07-06 DAL1713 - Jul 6, 02:45 UTCJul 6, 04:55 UTC2h 10m
2026-07-06 DAL3169 - Jul 6, 00:10 UTCJul 6, 01:15 UTC1h 5m
2026-07-05 DAL3169 ATL → CVG Jul 5, 19:25 UTCJul 5, 20:30 UTC1h 5m
2026-07-05 DAL570 ATL → BOS Jul 5, 13:25 UTCJul 5, 17:50 UTC4h 25m
2026-07-04 DAL750 ATL → SFO Jul 4, 16:25 UTCJul 4, 20:55 UTC4h 30m
2026-07-04 DAL1536 STL → ATL Jul 4, 13:05 UTCJul 4, 14:15 UTC1h 10m
2026-07-04 DAL1403 ATL → STL Jul 4, 03:40 UTCJul 4, 04:50 UTC1h 10m
2026-07-04 DAL2329 ORF → ATL Jul 4, 00:15 UTCJul 4, 01:30 UTC1h 15m
2026-07-03 DAL2329 ATL → ORF Jul 3, 20:55 UTCJul 3, 22:10 UTC1h 15m
2026-07-03 DAL2755 ORF → ATL Jul 3, 17:00 UTCJul 3, 18:35 UTC1h 35m
2026-07-03 DAL2755 ATL → ORF Jul 3, 13:25 UTCJul 3, 14:40 UTC1h 15m
2026-07-03 DAL2469 CMH → ATL Jul 3, 09:59 UTCJul 3, 11:04 UTC1h 5m
2026-07-03 DAL1545 ATL → CMH Jul 3, 00:20 UTCJul 3, 01:25 UTC1h 5m

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 N905DN page for operator, model, and routing details .

Mode-S AC8217 frequently asked

What is Mode-S code AC8217?
AC8217 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N905DN.
Where is Mode-S AC8217 registered?
Mode-S code AC8217 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 AC8217 broadcasting right now?
Yes. Mode-S AC8217 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC8217, octal 53101027, decimal 11,305,495.
What flights does AC8217 operate?
Mode-S AC8217 has broadcast 20 distinct callsigns, including DAL2022, DAL637, DAL3169, DAL2829, DAL1188.