Apparatus

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sensors Mode-S transponder

AB2855

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N818NW · AIRBUS A-330-300 · operated by DELTA AIR LINES INC

Hex
AB2855
Octal
52624125
Decimal
11,216,981
Country
US
Tail
N818NW
Type
A333
No current signal · last broadcast 1h ago
Flights observed
256
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AB2855.

Country allocation

The ICAO 24-bit address AB2855 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
DAL185 Delta Air Lines 11 2026-06-17
DAL184 - 10 2026-06-17
DAL72 - 8 2026-07-04
DAL128 Delta Air Lines 8 2026-06-07
DAL74 - 7 2026-07-01
DAL231 Delta Air Lines 6 2026-06-07
DAL177 - 6 2026-07-03
DAL176 - 6 2026-07-03
DAL75 - 5 2026-07-02
DAL259 Delta Air Lines 5 2026-04-14
DAL258 Delta Air Lines 5 2026-04-14
DAL230 Delta Air Lines 5 2026-06-07
DAL207 - 5 2026-07-12
DAL135 Delta Air Lines 5 2026-07-04
DAL113 Delta Air Lines 5 2026-07-05
DAL104 - 5 2026-06-27
DAL747 Delta Air Lines 4 2026-04-15
DAL47 - 4 2026-06-19
DAL267 Delta Air Lines 4 2026-04-15
DAL206 - 4 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL228 - Jul 13, 22:55 UTCJul 14, 01:15 UTC2h 20m
2026-07-13 DAL23 MUC → DTW Jul 13, 07:10 UTCJul 13, 15:45 UTC8h 35m
2026-07-12 DAL22 - Jul 12, 20:45 UTCJul 13, 04:55 UTC8h 10m
2026-07-12 DAL22 DTW → MUC Jul 12, 20:43 UTCJul 13, 04:58 UTC8h 15m
2026-07-12 DAL207 - Jul 12, 07:10 UTCJul 12, 09:15 UTC2h 5m
2026-07-12 DAL207 FCO → DTW Jul 12, 07:09 UTCJul 12, 16:30 UTC9h 21m
2026-07-11 DAL112 BOS → FCO Jul 11, 21:15 UTCJul 12, 04:40 UTC7h 25m
2026-07-11 DAL277 MXP → BOS Jul 11, 10:11 UTCJul 11, 18:22 UTC8h 11m
2026-07-11 DAL277 MXP → BOS Jul 11, 10:10 UTCJul 11, 18:20 UTC8h 10m
2026-07-11 DAL276 - Jul 11, 00:10 UTCJul 11, 07:10 UTC7h 0m
2026-07-10 DAL251 - Jul 10, 13:40 UTCJul 10, 15:15 UTC1h 35m
2026-07-10 DAL251 BCN → BOS Jul 10, 13:40 UTCJul 10, 21:17 UTC7h 37m
2026-07-10 DAL251 BCN → BOS Jul 10, 13:40 UTCJul 10, 21:09 UTC7h 29m
2026-07-10 DAL194 - Jul 10, 02:25 UTCJul 10, 04:25 UTC2h 0m
2026-07-10 DAL194 ATL → BCN Jul 10, 02:20 UTCJul 10, 10:52 UTC8h 32m
2026-07-09 DAL67 - Jul 9, 12:05 UTCJul 9, 22:25 UTC10h 20m
2026-07-09 DAL67 FCO → ATL Jul 9, 12:04 UTCJul 9, 22:22 UTC10h 18m
2026-07-08 DAL66 ATL → FCO Jul 8, 23:40 UTCJul 9, 09:05 UTC9h 25m
2026-07-07 DAL85 - Jul 7, 15:10 UTCJul 7, 16:40 UTC1h 30m
2026-07-07 DAL85 CDG → ATL Jul 7, 15:09 UTCJul 7, 23:46 UTC8h 37m
2026-07-07 DAL85 CDG → ATL Jul 7, 15:09 UTCJul 7, 23:45 UTC8h 36m
2026-07-07 DAL84 - Jul 7, 04:30 UTCJul 7, 12:30 UTC8h 0m
2026-07-06 DAL2293 JFK → ATL Jul 6, 23:50 UTCJul 7, 01:30 UTC1h 40m
2026-07-06 DAL129 JFK → BCN Jul 6, 09:50 UTCJul 6, 17:45 UTC7h 55m
2026-07-05 DAL250 ICN → SEA Jul 5, 23:50 UTCJul 6, 06:25 UTC6h 35m
2026-07-05 DAL250 ICN → SEA Jul 5, 23:50 UTCJul 6, 06:25 UTC6h 35m
2026-07-05 DAL113 FCO → BOS Jul 5, 11:37 UTCJul 5, 20:11 UTC8h 34m
2026-07-05 DAL113 FCO → BOS Jul 5, 11:40 UTCJul 5, 20:10 UTC8h 30m
2026-07-05 DAL113 FCO → BOS Jul 5, 11:37 UTCJul 5, 20:06 UTC8h 29m
2026-07-05 DAL206 - Jul 5, 00:15 UTCJul 5, 08:20 UTC8h 5m
2026-07-04 DAL135 AMS → DTW Jul 4, 10:25 UTCJul 4, 18:40 UTC8h 15m
2026-07-04 DAL72 - Jul 4, 00:10 UTCJul 4, 07:15 UTC7h 5m
2026-07-04 DAL72 ATL → AMS Jul 4, 00:07 UTCJul 4, 07:53 UTC7h 46m
2026-07-03 DAL177 DUB → ATL Jul 3, 10:22 UTCJul 3, 18:41 UTC8h 19m
2026-07-03 DAL177 DUB → ATL Jul 3, 10:22 UTCJul 3, 18:55 UTC8h 33m
2026-07-03 DAL177 - Jul 3, 10:25 UTCJul 3, 11:20 UTC55m
2026-07-03 DAL176 ATL → DUB Jul 3, 00:45 UTCJul 3, 07:45 UTC7h 0m
2026-07-02 DAL75 AMS → ATL Jul 2, 11:40 UTCJul 2, 20:50 UTC9h 10m
2026-07-02 DAL162 - Jul 2, 01:00 UTCJul 2, 08:15 UTC7h 15m
2026-07-01 DAL163 - Jul 1, 11:25 UTCJul 1, 20:45 UTC9h 20m
2026-07-01 DAL74 - Jul 1, 00:15 UTCJul 1, 03:30 UTC3h 15m
2026-07-01 DAL74 ATL → AMS Jul 1, 00:12 UTCJul 1, 08:12 UTC8h 0m
2026-06-30 DAL75 AMS → ATL Jun 30, 12:00 UTCJun 30, 20:40 UTC8h 40m
2026-06-30 DAL75 AMS → ATL Jun 30, 11:56 UTCJun 30, 20:36 UTC8h 40m
2026-06-29 DAL74 ATL → AMS Jun 29, 23:54 UTCJun 30, 08:05 UTC8h 11m
2026-06-29 DAL75 - Jun 29, 11:50 UTCJun 29, 20:35 UTC8h 45m
2026-06-29 DAL74 ATL → AMS Jun 29, 00:01 UTCJun 29, 07:57 UTC7h 56m
2026-06-29 DAL74 ATL → AMS Jun 29, 00:05 UTCJun 29, 07:59 UTC7h 55m
2026-06-28 DAL175 MXP → ATL Jun 28, 10:30 UTCJun 28, 20:09 UTC9h 40m
2026-06-27 DAL174 ATL → MXP Jun 27, 22:24 UTCJun 28, 06:55 UTC8h 31m

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 N818NW page for operator, model, and routing details .

Mode-S AB2855 frequently asked

What is Mode-S code AB2855?
AB2855 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N818NW.
Where is Mode-S AB2855 registered?
Mode-S code AB2855 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 AB2855 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB2855, octal 52624125, decimal 11,216,981.
What flights does AB2855 operate?
Mode-S AB2855 has broadcast 20 distinct callsigns, including DAL185, DAL184, DAL72, DAL128, DAL74.