Apparatus

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sensors Mode-S transponder

AB321C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N820NW · AIRBUS A-330-300 · operated by DELTA AIR LINES INC

Hex
AB321C
Octal
52631034
Decimal
11,219,484
Country
US
Tail
N820NW
Type
A333
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
296
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AB321C.

Country allocation

The ICAO 24-bit address AB321C 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
DAL134 - 12 2026-06-12
DAL193 Delta Air Lines 11 2026-07-24
DAL229 - 10 2026-07-07
DAL192 Delta Air Lines 10 2026-07-24
DAL151 Delta Air Lines 10 2026-07-26
DAL74 Delta Air Lines 9 2026-07-22
DAL837 Delta Air Lines 8 2026-05-28
DAL75 Delta Air Lines 8 2026-07-23
DAL313 Delta Air Lines 8 2026-05-29
DAL194 - 8 2026-06-25
DAL162 Delta Air Lines 8 2026-07-23
DAL152 Delta Air Lines 8 2026-07-06
DAL150 Delta Air Lines 8 2026-07-26
DAL105 - 8 2026-07-16
DAL97 Delta Air Lines 7 2026-04-22
DAL73 Delta Air Lines 7 2026-06-05
DAL312 Delta Air Lines 7 2026-05-29
DAL309 Delta Air Lines 7 2026-05-30
DAL228 Delta Air Lines 7 2026-07-06
DAL163 - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL151 ATL → LIM Jul 26, 20:20 UTCJul 26, 23:00 UTC2h 40m
2026-07-26 DAL150 LIM → ATL Jul 26, 05:45 UTCJul 26, 09:00 UTC3h 16m
2026-07-26 DAL150 LIM → ATL Jul 26, 05:16 UTCJul 26, 11:41 UTC6h 25m
2026-07-25 DAL151 ATL → LIM Jul 25, 20:30 UTCJul 25, 23:00 UTC2h 30m
2026-07-25 DAL151 ATL → LIM Jul 25, 20:29 UTCJul 26, 02:46 UTC6h 17m
2026-07-24 DAL193 VCE → ATL Jul 24, 12:50 UTCJul 24, 21:00 UTC8h 10m
2026-07-24 DAL193 VCE → ATL Jul 24, 12:45 UTCJul 24, 22:34 UTC9h 49m
2026-07-24 DAL192 ATL → VCE Jul 24, 01:35 UTCJul 24, 10:20 UTC8h 45m
2026-07-23 DAL75 AMS → ATL Jul 23, 11:40 UTCJul 23, 20:30 UTC8h 50m
2026-07-23 DAL162 MSP → AMS Jul 23, 01:30 UTCJul 23, 03:00 UTC1h 30m
2026-07-23 DAL162 MSP → AMS Jul 23, 01:29 UTCJul 23, 09:15 UTC7h 46m
2026-07-22 DAL163 - Jul 22, 11:35 UTCJul 22, 13:05 UTC1h 30m
2026-07-22 DAL163 AMS → MSP Jul 22, 11:30 UTCJul 22, 19:58 UTC8h 28m
2026-07-22 DAL74 ATL → AMS Jul 22, 00:20 UTCJul 22, 03:25 UTC3h 5m
2026-07-21 DAL177 DUB → ATL Jul 21, 10:20 UTCJul 21, 18:35 UTC8h 15m
2026-07-21 DAL176 ATL → DUB Jul 21, 00:31 UTCJul 21, 07:40 UTC7h 9m
2026-07-21 DAL176 ATL → DUB Jul 21, 00:35 UTCJul 21, 07:50 UTC7h 15m
2026-07-20 DAL75 AMS → ATL Jul 20, 11:50 UTCJul 20, 20:30 UTC8h 40m
2026-07-20 DAL162 MSP → AMS Jul 20, 01:15 UTCJul 20, 09:05 UTC7h 50m
2026-07-19 DAL163 - Jul 19, 11:05 UTCJul 19, 19:10 UTC8h 5m
2026-07-19 DAL74 ATL → AMS Jul 19, 00:15 UTCJul 19, 08:15 UTC8h 0m
2026-07-18 DAL104 GRU → ATL Jul 18, 02:00 UTCJul 18, 10:55 UTC8h 56m
2026-07-16 DAL105 ATL → GRU Jul 16, 23:47 UTCJul 17, 08:45 UTC8h 58m
2026-07-16 DAL105 - Jul 16, 23:49 UTCJul 17, 02:59 UTC3h 10m
2026-07-16 DAL177 DUB → ATL Jul 16, 12:20 UTCJul 16, 20:09 UTC7h 50m
2026-07-16 DAL177 DUB → ATL Jul 16, 12:15 UTCJul 16, 20:05 UTC7h 50m
2026-07-16 DAL176 ATL → DUB Jul 16, 02:25 UTCJul 16, 09:45 UTC7h 20m
2026-07-15 DAL75 - Jul 15, 11:45 UTCJul 15, 20:35 UTC8h 50m
2026-07-15 DAL162 MSP → AMS Jul 15, 01:10 UTCJul 15, 08:55 UTC7h 45m
2026-07-14 DAL163 - Jul 14, 12:00 UTCJul 14, 20:05 UTC8h 5m
2026-07-14 DAL74 ATL → AMS Jul 14, 01:00 UTCJul 14, 09:15 UTC8h 15m
2026-07-14 DAL74 - Jul 14, 01:00 UTCJul 14, 09:00 UTC8h 0m
2026-07-13 DAL193 - Jul 13, 11:55 UTCJul 13, 21:50 UTC9h 55m
2026-07-13 DAL192 - Jul 13, 00:25 UTCJul 13, 09:25 UTC9h 0m
2026-07-12 DAL175 MXP → ATL Jul 12, 12:20 UTCJul 12, 21:55 UTC9h 35m
2026-07-12 DAL174 ATL → MXP Jul 12, 00:55 UTCJul 12, 09:35 UTC8h 40m
2026-07-11 DAL193 - Jul 11, 10:20 UTCJul 11, 20:55 UTC10h 35m
2026-07-10 DAL192 ATL → VCE Jul 10, 22:20 UTCJul 11, 07:10 UTC8h 50m
2026-07-10 DAL177 DUB → ATL Jul 10, 10:30 UTCJul 10, 18:55 UTC8h 25m
2026-07-10 DAL176 ATL → DUB Jul 10, 00:35 UTCJul 10, 07:35 UTC7h 0m
2026-07-09 DAL195 BCN → ATL Jul 9, 09:55 UTCJul 9, 19:15 UTC9h 20m
2026-07-08 DAL250 BOS → BCN Jul 8, 23:31 UTCJul 9, 06:20 UTC6h 49m
2026-07-08 DAL250 - Jul 8, 23:35 UTCJul 9, 06:30 UTC6h 55m
2026-07-08 DAL113 - Jul 8, 12:10 UTCJul 8, 20:20 UTC8h 10m
2026-07-08 DAL206 - Jul 8, 00:50 UTCJul 8, 09:00 UTC8h 10m
2026-07-08 DAL206 DTW → FCO Jul 8, 00:46 UTCJul 8, 09:30 UTC8h 44m
2026-07-07 DAL229 - Jul 7, 09:00 UTCJul 7, 16:50 UTC7h 50m
2026-07-06 DAL152 JFK → FCO Jul 6, 21:40 UTCJul 7, 05:40 UTC8h 0m
2026-07-06 DAL153 - Jul 6, 10:25 UTCJul 6, 18:55 UTC8h 30m
2026-07-06 DAL228 CVG → CDG Jul 6, 00:25 UTCJul 6, 07:30 UTC7h 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 N820NW page for operator, model, and routing details .

Mode-S AB321C frequently asked

What is Mode-S code AB321C?
AB321C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N820NW.
Where is Mode-S AB321C registered?
Mode-S code AB321C 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 AB321C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB321C, octal 52631034, decimal 11,219,484.
What flights does AB321C operate?
Mode-S AB321C has broadcast 20 distinct callsigns, including DAL134, DAL193, DAL229, DAL192, DAL151.