Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A71612

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N556DT · operated by DELTA AIR LINES INC

Hex
A71612
Octal
51613022
Decimal
10,950,162
Country
US
Tail
N556DT
Broadcasting now · callsign DAL495 · 1,100 ft
Flights observed
111
Distinct callsigns
13
Country
US
Last broadcast
1h ago

Current position

A71612 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A71612 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 13 distinct

Callsign Airline Flights Last seen
DAL495 - 23 2026-07-14
DAL898 - 16 2026-07-13
DAL528 - 15 2026-07-13
DAL446 - 12 2026-07-11
DAL827 - 9 2026-07-11
DAL725 - 8 2026-07-09
DAL542 - 8 2026-07-12
DAL774 - 7 2026-07-12
DAL693 - 6 2026-07-10
DAL320 - 3 2026-07-11
DAL331 - 2 2026-07-11
DAL834 - 1 2026-07-09
DAL409 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL495 - Jul 14, 07:25 UTCJul 14, 10:30 UTC3h 5m
2026-07-14 DAL495 ATL → SFO Jul 14, 01:15 UTCJul 14, 05:40 UTC4h 25m
2026-07-13 DAL528 LAX → ATL Jul 13, 18:30 UTCJul 13, 22:30 UTC4h 0m
2026-07-13 DAL898 ATL → LAX Jul 13, 12:25 UTCJul 13, 16:25 UTC4h 0m
2026-07-12 DAL542 SEA → ATL Jul 12, 20:50 UTCJul 13, 01:20 UTC4h 30m
2026-07-12 DAL774 ATL → SEA Jul 12, 14:01 UTCJul 12, 18:45 UTC4h 45m
2026-07-11 DAL446 - Jul 11, 19:20 UTCJul 11, 23:35 UTC4h 15m
2026-07-11 DAL827 - Jul 11, 13:40 UTCJul 11, 17:25 UTC3h 45m
2026-07-11 DAL320 - Jul 11, 08:05 UTCJul 11, 12:05 UTC4h 0m
2026-07-11 DAL320 LAX → ATL Jul 11, 08:02 UTCJul 11, 11:56 UTC3h 54m
2026-07-11 DAL331 ATL → LAX Jul 11, 02:25 UTCJul 11, 06:30 UTC4h 5m
2026-07-10 DAL693 SFO → ATL Jul 10, 19:55 UTCJul 11, 00:05 UTC4h 10m
2026-07-10 DAL693 ATL → SFO Jul 10, 12:30 UTCJul 10, 17:00 UTC4h 30m
2026-07-10 DAL409 SEA → ATL Jul 10, 06:25 UTCJul 10, 10:45 UTC4h 20m
2026-07-09 DAL834 ATL → SEA Jul 9, 23:55 UTCJul 10, 04:50 UTC4h 55m
2026-07-09 DAL725 - Jul 9, 18:05 UTCJul 9, 22:00 UTC3h 55m
2026-07-09 DAL725 ATL → SAN Jul 9, 12:20 UTCJul 9, 16:10 UTC3h 50m
2026-07-09 DAL495 SFO → ATL Jul 9, 06:45 UTCJul 9, 10:45 UTC4h 0m
2026-07-08 DAL495 ATL → SFO Jul 8, 23:55 UTCJul 9, 04:35 UTC4h 40m
2026-07-08 DAL725 - Jul 8, 18:00 UTCJul 8, 21:55 UTC3h 55m
2026-07-08 DAL725 - Jul 8, 12:30 UTCJul 8, 16:20 UTC3h 50m
2026-07-08 DAL495 - Jul 8, 06:40 UTCJul 8, 10:50 UTC4h 10m
2026-07-07 DAL495 ATL → SFO Jul 7, 23:55 UTCJul 8, 04:40 UTC4h 45m
2026-07-07 DAL528 - Jul 7, 18:15 UTCJul 7, 22:20 UTC4h 5m
2026-07-07 DAL898 ATL → LAX Jul 7, 12:25 UTCJul 7, 16:30 UTC4h 5m
2026-06-28 DAL495 - Jun 28, 06:15 UTCJun 28, 10:10 UTC3h 55m
2026-06-28 DAL495 SFO → ATL Jun 28, 06:12 UTCJun 28, 10:08 UTC3h 56m
2026-06-27 DAL495 ATL → SFO Jun 27, 23:34 UTCJun 28, 04:25 UTC4h 50m
2026-06-27 DAL725 SAN → ATL Jun 27, 18:04 UTCJun 27, 21:55 UTC3h 50m
2026-06-27 DAL725 ATL → SAN Jun 27, 12:39 UTCJun 27, 16:35 UTC3h 55m
2026-06-27 DAL495 - Jun 27, 07:10 UTCJun 27, 11:25 UTC4h 15m
2026-06-27 DAL495 ATL → SFO Jun 27, 00:20 UTCJun 27, 05:25 UTC5h 5m
2026-06-26 DAL528 LAX → ATL Jun 26, 18:44 UTCJun 26, 22:29 UTC3h 45m
2026-06-26 DAL898 ATL → LAX Jun 26, 13:04 UTCJun 26, 17:19 UTC4h 15m
2026-06-25 DAL542 SEA → ATL Jun 25, 21:10 UTCJun 26, 01:15 UTC4h 5m
2026-06-25 DAL774 ATL → SEA Jun 25, 14:09 UTCJun 25, 19:05 UTC4h 55m
2026-06-24 DAL528 - Jun 24, 18:55 UTCJun 24, 22:45 UTC3h 50m
2026-06-24 DAL898 - Jun 24, 12:30 UTCJun 24, 16:45 UTC4h 15m
2026-06-23 DAL542 - Jun 23, 20:59 UTCJun 24, 00:59 UTC4h 0m
2026-06-23 DAL542 SEA → ATL Jun 23, 20:55 UTCJun 24, 00:52 UTC3h 57m
2026-06-23 DAL774 ATL → SEA Jun 23, 14:10 UTCJun 23, 19:10 UTC5h 0m
2026-06-23 DAL495 SFO → ATL Jun 23, 06:34 UTCJun 23, 10:39 UTC4h 5m
2026-06-23 DAL495 ATL → SFO Jun 23, 00:15 UTCJun 23, 04:55 UTC4h 40m
2026-06-22 DAL528 - Jun 22, 18:24 UTCJun 22, 22:19 UTC3h 55m
2026-06-22 DAL898 ATL → LAX Jun 22, 12:44 UTCJun 22, 17:00 UTC4h 15m
2026-06-21 DAL446 - Jun 21, 19:24 UTCJun 21, 23:05 UTC3h 40m
2026-06-21 DAL827 ATL → LAX Jun 21, 13:29 UTCJun 21, 17:39 UTC4h 10m
2026-06-21 DAL495 SFO → ATL Jun 21, 06:10 UTCJun 21, 10:09 UTC4h 0m
2026-06-20 DAL495 ATL → SFO Jun 20, 23:34 UTCJun 21, 04:30 UTC4h 55m
2026-06-20 DAL725 - Jun 20, 18:04 UTCJun 20, 21:44 UTC3h 40m

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 N556DT page for operator, model, and routing details .

Mode-S A71612 frequently asked

What is Mode-S code A71612?
A71612 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N556DT.
Where is Mode-S A71612 registered?
Mode-S code A71612 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 A71612 broadcasting right now?
Yes. Mode-S A71612 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A71612, octal 51613022, decimal 10,950,162.
What flights does A71612 operate?
Mode-S A71612 has broadcast 13 distinct callsigns, including DAL495, DAL898, DAL528, DAL446, DAL827.