Apparatus

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sensors Mode-S transponder

AB538B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N829NW · AIRBUS A-330-300 · operated by BANK OF UTAH TRUSTEE

Hex
AB538B
Octal
52651613
Decimal
11,228,043
Country
US
Tail
N829NW
Type
A333
Broadcasting now · callsign DAL177 · 38,000 ft
Flights observed
254
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AB538B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AB538B 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
DAL152 Delta Air Lines 10 2026-06-04
DAL75 - 9 2026-07-13
DAL259 Delta Air Lines 9 2026-05-01
DAL250 Delta Air Lines 8 2026-06-29
DAL207 - 8 2026-06-28
DAL195 - 8 2026-06-30
DAL163 - 8 2026-07-12
DAL153 Delta Air Lines 8 2026-06-06
DAL277 - 7 2026-06-27
DAL276 - 7 2026-06-27
DAL251 Delta Air Lines 7 2026-06-26
DAL228 Delta Air Lines 7 2026-06-05
DAL194 - 7 2026-06-26
DAL176 - 7 2026-07-14
DAL74 - 6 2026-07-12
DAL72 Delta Air Lines 6 2026-05-08
DAL206 - 6 2026-06-29
DAL177 - 6 2026-07-14
DAL162 - 6 2026-07-13
DAL113 Delta Air Lines 6 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL177 - Jul 14, 11:00 UTCJul 14, 16:45 UTC5h 45m
2026-07-14 DAL176 ATL → DUB Jul 14, 00:58 UTCJul 14, 08:34 UTC7h 36m
2026-07-14 DAL176 - Jul 14, 01:00 UTCJul 14, 04:00 UTC3h 0m
2026-07-13 DAL75 AMS → ATL Jul 13, 12:16 UTCJul 13, 20:56 UTC8h 40m
2026-07-13 DAL75 - Jul 13, 12:20 UTCJul 13, 21:05 UTC8h 45m
2026-07-13 DAL162 MSP → AMS Jul 13, 01:25 UTCJul 13, 09:25 UTC8h 0m
2026-07-12 DAL163 - Jul 12, 11:01 UTCJul 12, 19:20 UTC8h 20m
2026-07-12 DAL74 - Jul 12, 00:05 UTCJul 12, 02:45 UTC2h 40m
2026-07-12 DAL74 ATL → AMS Jul 12, 00:05 UTCJul 12, 08:08 UTC8h 3m
2026-07-11 DAL75 AMS → ATL Jul 11, 11:39 UTCJul 11, 21:04 UTC9h 25m
2026-07-11 DAL75 - Jul 11, 11:40 UTCJul 11, 21:05 UTC9h 25m
2026-07-11 DAL162 - Jul 11, 03:40 UTCJul 11, 08:55 UTC5h 15m
2026-07-11 DAL162 - Jul 11, 01:10 UTCJul 11, 03:35 UTC2h 25m
2026-07-10 DAL163 AMS → MSP Jul 10, 11:06 UTCJul 10, 19:34 UTC8h 28m
2026-07-10 DAL163 - Jul 10, 11:10 UTCJul 10, 12:40 UTC1h 30m
2026-07-10 DAL242 - Jul 10, 00:40 UTCJul 10, 01:50 UTC1h 10m
2026-07-10 DAL242 BOS → AMS Jul 10, 00:35 UTCJul 10, 06:47 UTC6h 12m
2026-07-09 DAL257 - Jul 9, 13:05 UTCJul 9, 20:20 UTC7h 15m
2026-07-09 DAL257 AMS → BOS Jul 9, 13:01 UTCJul 9, 20:16 UTC7h 15m
2026-07-09 DAL162 MSP → AMS Jul 9, 01:20 UTCJul 9, 08:55 UTC7h 35m
2026-07-08 DAL163 AMS → MSP Jul 8, 11:06 UTCJul 8, 19:30 UTC8h 24m
2026-07-08 DAL163 - Jul 8, 11:10 UTCJul 8, 13:50 UTC2h 40m
2026-07-08 DAL74 ATL → AMS Jul 8, 00:20 UTCJul 8, 08:35 UTC8h 15m
2026-07-07 DAL75 AMS → ATL Jul 7, 11:57 UTCJul 7, 20:56 UTC8h 59m
2026-07-07 DAL75 AMS → ATL Jul 7, 11:57 UTCJul 7, 20:51 UTC8h 54m
2026-07-07 DAL75 - Jul 7, 12:00 UTCJul 7, 12:45 UTC45m
2026-07-07 DAL162 - Jul 7, 01:15 UTCJul 7, 02:05 UTC50m
2026-07-07 DAL162 MSP → AMS Jul 7, 01:15 UTCJul 7, 08:59 UTC7h 44m
2026-07-06 DAL163 - Jul 6, 11:50 UTCJul 6, 14:45 UTC2h 55m
2026-07-06 DAL163 AMS → MSP Jul 6, 11:48 UTCJul 6, 20:17 UTC8h 29m
2026-07-06 DAL163 AMS → MSP Jul 6, 11:48 UTCJul 6, 20:13 UTC8h 25m
2026-07-06 DAL74 ATL → AMS Jul 6, 01:00 UTCJul 6, 08:58 UTC7h 58m
2026-07-06 DAL74 - Jul 6, 01:00 UTCJul 6, 08:45 UTC7h 45m
2026-07-05 DAL150 - Jul 5, 05:45 UTCJul 5, 11:45 UTC6h 0m
2026-07-05 DAL150 LIM → ATL Jul 5, 05:26 UTCJul 5, 11:44 UTC6h 18m
2026-07-04 DAL151 ATL → LIM Jul 4, 20:33 UTCJul 5, 02:44 UTC6h 11m
2026-07-04 DAL151 - Jul 4, 20:35 UTCJul 4, 22:10 UTC1h 35m
2026-07-04 DAL309 - Jul 4, 05:45 UTCJul 4, 09:35 UTC3h 50m
2026-07-04 DAL309 - Jul 4, 01:40 UTCJul 4, 02:00 UTC20m
2026-07-03 DAL312 JFK → HNL Jul 3, 23:20 UTCJul 3, 23:40 UTC20m
2026-07-03 DAL312 JFK → HNL Jul 3, 15:35 UTCJul 3, 19:15 UTC3h 40m
2026-07-03 DAL312 JFK → HNL Jul 3, 15:31 UTCJul 3, 23:35 UTC8h 4m
2026-07-03 DAL313 - Jul 3, 06:35 UTCJul 3, 09:50 UTC3h 15m
2026-07-03 DAL313 - Jul 3, 02:30 UTCJul 3, 02:50 UTC20m
2026-07-02 DAL837 - Jul 2, 14:55 UTCJul 3, 00:05 UTC9h 10m
2026-07-02 DAL104 - Jul 2, 02:35 UTCJul 2, 11:40 UTC9h 5m
2026-06-30 DAL105 ATL → GRU Jun 30, 23:21 UTCJul 1, 08:22 UTC9h 1m
2026-06-30 DAL105 - Jun 30, 23:25 UTCJul 1, 04:00 UTC4h 35m
2026-06-30 DAL195 BCN → ATL Jun 30, 09:25 UTCJun 30, 18:35 UTC9h 10m
2026-06-30 DAL195 BCN → ATL Jun 30, 09:20 UTCJun 30, 18:33 UTC9h 13m

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 N829NW page for operator, model, and routing details .

Mode-S AB538B frequently asked

What is Mode-S code AB538B?
AB538B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N829NW.
Where is Mode-S AB538B registered?
Mode-S code AB538B 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 AB538B broadcasting right now?
Yes. Mode-S AB538B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB538B, octal 52651613, decimal 11,228,043.
What flights does AB538B operate?
Mode-S AB538B has broadcast 20 distinct callsigns, including DAL152, DAL75, DAL259, DAL250, DAL207.