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
Broadcasting now · callsign DAL74 · 39,000 ft
Flights observed
265
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Current position

AB321C is currently broadcasting. Map zoomed to live position.

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
DAL229 - 10 2026-07-07
DAL193 - 9 2026-07-13
DAL192 - 9 2026-07-13
DAL837 Delta Air Lines 8 2026-05-28
DAL313 Delta Air Lines 8 2026-05-29
DAL194 - 8 2026-06-25
DAL152 Delta Air Lines 8 2026-07-06
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
DAL151 - 7 2026-06-16
DAL98 Delta Air Lines 6 2026-04-22
DAL74 - 6 2026-07-14
DAL266 Delta Air Lines 6 2026-04-22
DAL150 - 6 2026-06-17
DAL135 Delta Air Lines 6 2026-06-13
DAL105 Delta Air Lines 6 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL74 - Jul 14, 01:00 UTCJul 14, 04:00 UTC3h 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
2026-07-05 DAL229 - Jul 5, 09:10 UTCJul 5, 11:00 UTC1h 50m
2026-07-05 DAL229 CDG → DTW Jul 5, 09:09 UTCJul 5, 17:24 UTC8h 15m
2026-07-04 DAL152 JFK → FCO Jul 4, 22:56 UTCJul 5, 06:24 UTC7h 28m
2026-07-04 DAL152 JFK → FCO Jul 4, 23:00 UTCJul 5, 06:35 UTC7h 35m
2026-07-04 DAL153 - Jul 4, 09:55 UTCJul 4, 18:35 UTC8h 40m
2026-07-04 DAL228 CVG → CDG Jul 4, 00:00 UTCJul 4, 07:10 UTC7h 10m
2026-07-03 DAL229 - Jul 3, 08:50 UTCJul 3, 17:20 UTC8h 30m
2026-07-02 DAL152 JFK → FCO Jul 2, 21:50 UTCJul 2, 22:35 UTC45m
2026-07-02 DAL152 JFK → FCO Jul 2, 21:50 UTCJul 3, 05:18 UTC7h 28m
2026-07-02 DAL153 - Jul 2, 09:35 UTCJul 2, 18:45 UTC9h 10m
2026-07-01 DAL228 CVG → CDG Jul 1, 22:55 UTCJul 2, 06:00 UTC7h 5m
2026-07-01 DAL229 - Jul 1, 09:00 UTCJul 1, 17:30 UTC8h 30m
2026-06-30 DAL152 JFK → FCO Jun 30, 22:25 UTCJul 1, 05:00 UTC6h 35m
2026-06-30 DAL152 JFK → FCO Jun 30, 22:24 UTCJul 1, 05:43 UTC7h 19m
2026-06-30 DAL163 AMS → MSP Jun 30, 11:40 UTCJun 30, 20:05 UTC8h 25m
2026-06-30 DAL163 AMS → MSP Jun 30, 11:39 UTCJun 30, 20:00 UTC8h 21m
2026-06-30 DAL162 MSP → AMS Jun 30, 01:04 UTCJun 30, 08:45 UTC7h 40m
2026-06-30 DAL162 MSP → AMS Jun 30, 01:02 UTCJun 30, 08:49 UTC7h 47m
2026-06-29 DAL117 STR → ATL Jun 29, 12:39 UTCJun 29, 14:09 UTC1h 30m
2026-06-29 DAL117 STR → ATL Jun 29, 12:39 UTCJun 29, 20:58 UTC8h 19m
2026-06-29 DAL116 ATL → STR Jun 29, 02:14 UTCJun 29, 10:08 UTC7h 54m
2026-06-29 DAL116 ATL → STR Jun 29, 02:14 UTCJun 29, 02:59 UTC45m
2026-06-28 DAL153 - Jun 28, 09:20 UTCJun 28, 17:34 UTC8h 15m
2026-06-27 DAL228 CVG → CDG Jun 27, 23:04 UTCJun 28, 06:30 UTC7h 25m
2026-06-27 DAL207 - Jun 27, 08:20 UTCJun 27, 17:34 UTC9h 15m
2026-06-26 DAL112 BOS → FCO Jun 26, 21:04 UTCJun 27, 04:09 UTC7h 5m
2026-06-26 DAL276 BOS → BOS Jun 26, 00:15 UTCJun 26, 00:39 UTC25m
2026-06-25 DAL251 NAS → MIA Jun 25, 13:29 UTCJun 25, 21:20 UTC7h 50m
2026-06-25 DAL251 NAS → MIA Jun 25, 13:29 UTCJun 25, 21:10 UTC7h 41m
2026-06-25 DAL194 ATL → BCN Jun 25, 02:10 UTCJun 25, 10:35 UTC8h 25m
2026-06-24 DAL175 MXP → ATL Jun 24, 10:19 UTCJun 24, 20:13 UTC9h 54m

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?
Yes. Mode-S AB321C is currently airborne.
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, DAL229, DAL193, DAL192, DAL837.