Apparatus

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sensors Mode-S transponder

AB2B23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N819DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AB2B23
Octal
52625443
Decimal
11,217,699
Country
US
Tail
N819DN
Type
B739
No current signal · last broadcast 2h ago
Flights observed
450
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AB2B23.

Country allocation

The ICAO 24-bit address AB2B23 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
DAL874 - 13 2026-07-06
DAL809 - 7 2026-07-01
DAL539 Delta Air Lines 6 2026-07-05
DAL656 Delta Air Lines 5 2026-04-20
DAL361 Delta Air Lines 5 2026-04-13
DAL3027 - 5 2026-06-25
DAL3013 - 5 2026-06-23
DAL2427 - 5 2026-07-12
DAL2208 - 5 2026-07-08
DAL1643 Delta Air Lines 5 2026-05-23
DAL1419 Delta Air Lines 5 2026-06-03
DAL687 Delta Air Lines 4 2026-06-06
DAL503 Delta Air Lines 4 2026-05-07
DAL469 Delta Air Lines 4 2026-04-14
DAL2590 Delta Air Lines 4 2026-05-07
DAL2554 - 4 2026-07-06
DAL2378 - 4 2026-06-23
DAL2227 Delta Air Lines 4 2026-06-24
DAL1913 Delta Air Lines 4 2026-04-24
DAL1414 Delta Air Lines 4 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL3244 ATL → RDU Jul 14, 01:49 UTCJul 14, 02:41 UTC52m
2026-07-14 DAL3244 ATL → RDU Jul 14, 01:50 UTCJul 14, 02:45 UTC55m
2026-07-13 DAL2484 - Jul 13, 23:25 UTCJul 14, 00:00 UTC35m
2026-07-13 DAL2484 - Jul 13, 21:35 UTCJul 13, 22:05 UTC30m
2026-07-13 DAL1965 - Jul 13, 17:35 UTCJul 13, 19:55 UTC2h 20m
2026-07-13 DAL1965 NAS → ATL Jul 13, 17:20 UTCJul 13, 20:00 UTC2h 40m
2026-07-13 DAL1944 - Jul 13, 13:50 UTCJul 13, 15:10 UTC1h 20m
2026-07-13 DAL3019 - Jul 13, 11:10 UTCJul 13, 11:55 UTC45m
2026-07-13 DAL3021 - Jul 13, 01:15 UTCJul 13, 02:01 UTC45m
2026-07-12 DAL2427 COS → ATL Jul 12, 19:55 UTCJul 12, 22:25 UTC2h 30m
2026-07-12 DAL2427 COS → ATL Jul 12, 19:53 UTCJul 12, 22:24 UTC2h 31m
2026-07-12 DAL2427 ATL → COS Jul 12, 15:45 UTCJul 12, 18:10 UTC2h 25m
2026-07-12 DAL1653 - Jul 12, 12:40 UTCJul 12, 14:05 UTC1h 25m
2026-07-11 DAL717 - Jul 11, 22:35 UTCJul 12, 02:35 UTC4h 0m
2026-07-11 DAL2074 MSP → SFO Jul 11, 17:50 UTCJul 11, 21:10 UTC3h 20m
2026-07-11 DAL2074 MSP → SFO Jul 11, 17:47 UTCJul 11, 21:10 UTC3h 23m
2026-07-11 DAL943 SEA → MSP Jul 11, 13:15 UTCJul 11, 16:00 UTC2h 45m
2026-07-11 DAL881 MSP → SEA Jul 11, 00:20 UTCJul 11, 03:30 UTC3h 10m
2026-07-11 DAL881 MSP → SEA Jul 11, 00:19 UTCJul 11, 03:28 UTC3h 9m
2026-07-10 DAL941 SEA → MSP Jul 10, 19:40 UTCJul 10, 22:30 UTC2h 50m
2026-07-10 DAL868 MSP → SEA Jul 10, 14:45 UTCJul 10, 17:50 UTC3h 5m
2026-07-10 DAL2510 LGA → MSP Jul 10, 10:10 UTCJul 10, 12:30 UTC2h 20m
2026-07-10 DAL2733 MSP → LGA Jul 10, 01:55 UTCJul 10, 04:10 UTC2h 15m
2026-07-09 DAL1701 SMF → MSP Jul 9, 20:25 UTCJul 9, 23:25 UTC3h 0m
2026-07-09 DAL1701 SMF → MSP Jul 9, 20:25 UTCJul 9, 23:25 UTC3h 0m
2026-07-09 DAL1701 MSP → SMF Jul 9, 16:00 UTCJul 9, 19:10 UTC3h 10m
2026-07-09 DAL1055 FAI → MSP Jul 9, 08:55 UTCJul 9, 14:00 UTC5h 5m
2026-07-08 DAL1055 MSP → FAI Jul 8, 23:30 UTCJul 9, 04:25 UTC4h 55m
2026-07-08 DAL2208 PHX → MSP Jul 8, 18:55 UTCJul 8, 21:50 UTC2h 55m
2026-07-08 DAL2208 MSP → PHX Jul 8, 14:40 UTCJul 8, 17:30 UTC2h 50m
2026-07-08 DAL2221 - Jul 8, 11:00 UTCJul 8, 12:35 UTC1h 35m
2026-07-08 DAL2221 BNA → MSP Jul 8, 10:58 UTCJul 8, 12:37 UTC1h 39m
2026-07-08 DAL790 ATL → BNA Jul 8, 00:40 UTCJul 8, 01:15 UTC35m
2026-07-07 DAL1214 - Jul 7, 21:40 UTCJul 7, 22:55 UTC1h 15m
2026-07-07 DAL1214 - Jul 7, 18:55 UTCJul 7, 20:05 UTC1h 10m
2026-07-07 DAL801 - Jul 7, 16:00 UTCJul 7, 17:25 UTC1h 25m
2026-07-07 DAL801 BWI → ATL Jul 7, 16:00 UTCJul 7, 17:26 UTC1h 26m
2026-07-07 DAL801 ATL → BWI Jul 7, 13:05 UTCJul 7, 14:30 UTC1h 25m
2026-07-07 DAL1192 - Jul 7, 10:35 UTCJul 7, 11:30 UTC55m
2026-07-07 DAL1154 ATL → RDU Jul 7, 02:05 UTCJul 7, 03:05 UTC1h 0m
2026-07-06 DAL874 - Jul 6, 20:20 UTCJul 7, 00:00 UTC3h 40m
2026-07-06 DAL874 - Jul 6, 14:45 UTCJul 6, 18:30 UTC3h 45m
2026-07-06 DAL2554 - Jul 6, 11:15 UTCJul 6, 13:10 UTC1h 55m
2026-07-06 DAL2765 ATL → BDL Jul 6, 01:20 UTCJul 6, 03:25 UTC2h 5m
2026-07-05 DAL539 ATL → PDX Jul 5, 18:50 UTCJul 5, 23:25 UTC4h 35m
2026-07-05 DAL539 ATL → PDX Jul 5, 12:45 UTCJul 5, 17:15 UTC4h 30m
2026-07-05 DAL2734 - Jul 5, 10:00 UTCJul 5, 11:15 UTC1h 15m
2026-07-04 DAL1350 ATL → CLE Jul 4, 21:55 UTCJul 4, 23:10 UTC1h 15m
2026-07-04 DAL1350 ATL → CLE Jul 4, 21:50 UTCJul 4, 23:10 UTC1h 20m
2026-07-04 DAL1965 - Jul 4, 17:35 UTCJul 4, 19:00 UTC1h 25m

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 N819DN page for operator, model, and routing details .

Mode-S AB2B23 frequently asked

What is Mode-S code AB2B23?
AB2B23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N819DN.
Where is Mode-S AB2B23 registered?
Mode-S code AB2B23 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 AB2B23 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB2B23, octal 52625443, decimal 11,217,699.
What flights does AB2B23 operate?
Mode-S AB2B23 has broadcast 20 distinct callsigns, including DAL874, DAL809, DAL539, DAL656, DAL361.