Apparatus

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sensors Mode-S transponder

A70AED

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N553DT · operated by DELTA AIR LINES INC

Hex
A70AED
Octal
51605355
Decimal
10,947,309
Country
US
Tail
N553DT
Broadcasting now · callsign DAL725 · 35,000 ft
Flights observed
83
Distinct callsigns
12
Country
US
Last broadcast
3h ago

Current position

A70AED is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A70AED 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 12 distinct

Callsign Airline Flights Last seen
DAL725 - 18 2026-07-01
DAL693 - 16 2026-06-30
DAL827 - 11 2026-06-29
DAL446 - 9 2026-06-29
DAL495 - 8 2026-06-19
DAL331 - 7 2026-06-29
DAL320 - 6 2026-06-29
DAL9936 Delta Air Lines 2 2026-05-06
DAL898 - 2 2026-06-18
DAL528 - 2 2026-06-18
DAL774 - 1 2026-06-17
DAL542 - 1 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-01 DAL725 - Jul 1, 12:15 UTCJul 1, 15:15 UTC3h 0m
2026-06-30 DAL693 - Jun 30, 18:55 UTCJun 30, 23:05 UTC4h 10m
2026-06-30 DAL693 ATL → SFO Jun 30, 12:40 UTCJun 30, 17:10 UTC4h 30m
2026-06-29 DAL446 - Jun 29, 19:24 UTCJun 29, 23:14 UTC3h 50m
2026-06-29 DAL827 - Jun 29, 13:34 UTCJun 29, 17:34 UTC4h 0m
2026-06-29 DAL320 - Jun 29, 07:40 UTCJun 29, 11:14 UTC3h 35m
2026-06-29 DAL320 LAX → ATL Jun 29, 07:35 UTCJun 29, 11:23 UTC3h 48m
2026-06-29 DAL331 ATL → LAX Jun 29, 01:14 UTCJun 29, 05:24 UTC4h 10m
2026-06-28 DAL446 - Jun 28, 19:20 UTCJun 28, 23:04 UTC3h 45m
2026-06-28 DAL446 LAX → ATL Jun 28, 19:17 UTCJun 28, 23:05 UTC3h 48m
2026-06-28 DAL827 ATL → LAX Jun 28, 13:29 UTCJun 28, 18:00 UTC4h 30m
2026-06-27 DAL693 SFO → ATL Jun 27, 18:45 UTCJun 27, 22:45 UTC4h 0m
2026-06-27 DAL693 ATL → SFO Jun 27, 12:19 UTCJun 27, 16:59 UTC4h 40m
2026-06-26 DAL446 - Jun 26, 19:20 UTCJun 26, 23:09 UTC3h 50m
2026-06-26 DAL827 ATL → LAX Jun 26, 13:41 UTCJun 26, 17:41 UTC4h 0m
2026-06-26 DAL827 ATL → LAX Jun 26, 13:45 UTCJun 26, 17:50 UTC4h 5m
2026-06-26 DAL320 - Jun 26, 07:10 UTCJun 26, 11:05 UTC3h 55m
2026-06-26 DAL331 ATL → LAX Jun 26, 01:04 UTCJun 26, 05:18 UTC4h 14m
2026-06-26 DAL331 ATL → LAX Jun 26, 01:05 UTCJun 26, 05:19 UTC4h 15m
2026-06-25 DAL693 SFO → ATL Jun 25, 19:05 UTCJun 25, 23:05 UTC4h 0m
2026-06-25 DAL693 SFO → ATL Jun 25, 19:04 UTCJun 25, 23:11 UTC4h 7m
2026-06-25 DAL693 ATL → SFO Jun 25, 13:05 UTCJun 25, 17:44 UTC4h 40m
2026-06-24 DAL446 LAX → ATL Jun 24, 19:24 UTCJun 24, 23:20 UTC3h 55m
2026-06-24 DAL827 ATL → LAX Jun 24, 13:34 UTCJun 24, 17:45 UTC4h 10m
2026-06-24 DAL827 ATL → LAX Jun 24, 13:31 UTCJun 24, 17:35 UTC4h 4m
2026-06-23 DAL693 - Jun 23, 18:55 UTCJun 23, 23:19 UTC4h 25m
2026-06-23 DAL693 ATL → SFO Jun 23, 12:35 UTCJun 23, 17:15 UTC4h 40m
2026-06-22 DAL446 - Jun 22, 19:19 UTCJun 22, 23:10 UTC3h 50m
2026-06-22 DAL827 ATL → LAX Jun 22, 13:35 UTCJun 22, 17:44 UTC4h 10m
2026-06-22 DAL827 ATL → LAX Jun 22, 13:32 UTCJun 22, 17:34 UTC4h 2m
2026-06-22 DAL320 BOS → SEA Jun 22, 07:14 UTCJun 22, 11:04 UTC3h 50m
2026-06-22 DAL331 ATL → LAX Jun 22, 01:10 UTCJun 22, 05:29 UTC4h 20m
2026-06-21 DAL693 - Jun 21, 18:54 UTCJun 21, 22:49 UTC3h 55m
2026-06-21 DAL693 ATL → SFO Jun 21, 12:40 UTCJun 21, 17:20 UTC4h 40m
2026-06-20 DAL693 SFO → ATL Jun 20, 18:54 UTCJun 20, 22:45 UTC3h 50m
2026-06-20 DAL693 ATL → SFO Jun 20, 12:24 UTCJun 20, 17:10 UTC4h 45m
2026-06-19 DAL446 - Jun 19, 19:34 UTCJun 19, 23:25 UTC3h 50m
2026-06-19 DAL827 ATL → LAX Jun 19, 13:34 UTCJun 19, 17:55 UTC4h 20m
2026-06-19 DAL495 SFO → ATL Jun 19, 07:39 UTCJun 19, 11:39 UTC4h 0m
2026-06-19 DAL495 ATL → SFO Jun 19, 01:24 UTCJun 19, 05:54 UTC4h 30m
2026-06-18 DAL528 - Jun 18, 18:20 UTCJun 18, 22:15 UTC3h 55m
2026-06-18 DAL898 ATL → LAX Jun 18, 12:45 UTCJun 18, 16:50 UTC4h 5m
2026-06-17 DAL542 - Jun 17, 21:40 UTCJun 18, 01:40 UTC4h 0m
2026-06-17 DAL774 ATL → SEA Jun 17, 14:15 UTCJun 17, 19:15 UTC5h 0m
2026-06-16 DAL725 - Jun 16, 17:59 UTCJun 16, 21:40 UTC3h 41m
2026-06-16 DAL725 ATL → SAN Jun 16, 12:35 UTCJun 16, 16:30 UTC3h 55m
2026-06-16 DAL320 BOS → SEA Jun 16, 07:09 UTCJun 16, 10:45 UTC3h 35m
2026-06-16 DAL331 ATL → LAX Jun 16, 01:10 UTCJun 16, 05:40 UTC4h 30m
2026-06-16 DAL331 ATL → LAX Jun 16, 01:10 UTCJun 16, 05:20 UTC4h 10m
2026-06-15 DAL693 - Jun 15, 19:30 UTCJun 15, 23:25 UTC3h 55m

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 N553DT page for operator, model, and routing details .

Mode-S A70AED frequently asked

What is Mode-S code A70AED?
A70AED is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N553DT.
Where is Mode-S A70AED registered?
Mode-S code A70AED 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 A70AED broadcasting right now?
Yes. Mode-S A70AED is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A70AED, octal 51605355, decimal 10,947,309.
What flights does A70AED operate?
Mode-S A70AED has broadcast 12 distinct callsigns, including DAL725, DAL693, DAL827, DAL446, DAL495.