Apparatus

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sensors Mode-S transponder

AD38BF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N951DX · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AD38BF
Octal
53234277
Decimal
11,352,255
Country
US
Tail
N951DX
Type
B739
Broadcasting now · callsign DAL861 · 35,000 ft
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

AD38BF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AD38BF 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
DAL809 - 6 2026-07-15
DAL2474 Delta Air Lines 6 2026-05-04
DAL2195 - 6 2026-07-11
DAL2160 Delta Air Lines 6 2026-05-05
DAL3056 Delta Air Lines 5 2026-05-21
DAL2238 Delta Air Lines 5 2026-05-26
DAL2208 - 5 2026-07-01
DAL2042 - 5 2026-07-09
DAL1596 Delta Air Lines 5 2026-05-28
DAL1196 - 5 2026-06-22
DAL1036 Delta Air Lines 5 2026-07-23
DAL1019 Delta Air Lines 5 2026-05-20
DAL874 - 4 2026-06-16
DAL627 Delta Air Lines 4 2026-05-01
DAL626 Delta Air Lines 4 2026-05-01
DAL532 - 4 2026-07-10
DAL361 Delta Air Lines 4 2026-06-10
DAL2999 Delta Air Lines 4 2026-07-26
DAL2973 - 4 2026-07-05
DAL2500 - 4 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1109 ATL → LGA Jul 26, 18:55 UTCJul 26, 21:25 UTC2h 30m
2026-07-26 DAL2999 RDU → BOS Jul 26, 15:35 UTCJul 26, 17:00 UTC1h 25m
2026-07-26 DAL2999 RDU → BOS Jul 26, 12:45 UTCJul 26, 14:25 UTC1h 40m
2026-07-26 DAL3098 IAH → LGA Jul 26, 09:50 UTCJul 26, 10:30 UTC40m
2026-07-25 DAL527 SAN → BOS Jul 25, 23:10 UTCJul 25, 23:50 UTC40m
2026-07-25 DAL2990 ATL → BOS Jul 25, 20:50 UTCJul 25, 21:35 UTC45m
2026-07-25 DAL2990 ATL → BOS Jul 25, 18:50 UTCJul 25, 19:40 UTC50m
2026-07-25 DAL932 JFK → ATL Jul 25, 16:50 UTCJul 25, 17:25 UTC35m
2026-07-25 DAL3054 CHS → ATL Jul 25, 14:00 UTCJul 25, 14:40 UTC40m
2026-07-25 DAL3001 BNA → ATL Jul 25, 11:35 UTCJul 25, 11:45 UTC10m
2026-07-25 DAL3001 BNA → ATL Jul 25, 11:31 UTCJul 25, 12:14 UTC43m
2026-07-25 DAL790 ATL → LGA Jul 25, 01:35 UTCJul 25, 02:15 UTC40m
2026-07-24 DAL2152 ATL → BDL Jul 24, 22:30 UTCJul 25, 00:00 UTC1h 30m
2026-07-24 DAL2152 ATL → BDL Jul 24, 18:35 UTCJul 24, 20:30 UTC1h 55m
2026-07-24 DAL2071 MSP → LAS Jul 24, 15:45 UTCJul 24, 16:40 UTC55m
2026-07-24 DAL2071 MSP → LAS Jul 24, 13:25 UTCJul 24, 14:20 UTC55m
2026-07-24 DAL1565 - Jul 24, 10:40 UTCJul 24, 11:45 UTC1h 5m
2026-07-24 DAL2083 BDL → ATL Jul 24, 03:20 UTCJul 24, 04:15 UTC55m
2026-07-23 DAL1036 SFO → DTW Jul 23, 22:30 UTCJul 24, 00:20 UTC1h 50m
2026-07-23 DAL2825 ATL → MSP Jul 23, 18:40 UTCJul 23, 20:50 UTC2h 10m
2026-07-23 DAL1424 PBI → LGA Jul 23, 15:55 UTCJul 23, 16:55 UTC1h 0m
2026-07-23 DAL1424 PBI → LGA Jul 23, 13:10 UTCJul 23, 14:10 UTC1h 0m
2026-07-23 DAL1499 - Jul 23, 10:15 UTCJul 23, 11:25 UTC1h 10m
2026-07-23 DAL1057 JFK → LAX Jul 23, 01:30 UTCJul 23, 02:35 UTC1h 5m
2026-07-23 DAL1057 JFK → LAX Jul 23, 01:30 UTCJul 23, 02:33 UTC1h 3m
2026-07-22 DAL1002 ATL → ELP Jul 22, 21:00 UTCJul 22, 23:30 UTC2h 30m
2026-07-22 DAL1002 ATL → ELP Jul 22, 16:30 UTCJul 22, 18:50 UTC2h 20m
2026-07-22 DAL1741 ELP → ATL Jul 22, 12:20 UTCJul 22, 14:50 UTC2h 30m
2026-07-22 DAL1713 ATL → ELP Jul 22, 02:00 UTCJul 22, 04:20 UTC2h 20m
2026-07-22 DAL1713 ATL → ELP Jul 22, 01:55 UTCJul 22, 04:26 UTC2h 31m
2026-07-21 DAL1660 - Jul 21, 22:45 UTCJul 22, 00:15 UTC1h 30m
2026-07-21 DAL1660 - Jul 21, 19:30 UTCJul 21, 21:10 UTC1h 40m
2026-07-17 DAL1036 MSP → ATL Jul 17, 23:05 UTCJul 18, 01:10 UTC2h 5m
2026-07-17 DAL1036 MSP → ATL Jul 17, 23:02 UTCJul 18, 01:10 UTC2h 8m
2026-07-17 DAL2825 ATL → MSP Jul 17, 19:20 UTCJul 17, 21:25 UTC2h 5m
2026-07-17 DAL2999 - Jul 17, 15:15 UTCJul 17, 16:49 UTC1h 35m
2026-07-17 DAL2999 ATL → MKE Jul 17, 12:19 UTCJul 17, 13:50 UTC1h 30m
2026-07-17 DAL3015 - Jul 17, 09:55 UTCJul 17, 10:25 UTC30m
2026-07-17 DAL3072 - Jul 17, 03:14 UTCJul 17, 03:45 UTC30m
2026-07-16 DAL2735 - Jul 16, 23:35 UTCJul 17, 01:25 UTC1h 50m
2026-07-16 DAL2735 - Jul 16, 20:09 UTCJul 16, 22:10 UTC2h 0m
2026-07-16 DAL801 - Jul 16, 17:35 UTCJul 16, 18:55 UTC1h 20m
2026-07-16 DAL801 ATL → BWI Jul 16, 14:45 UTCJul 16, 16:09 UTC1h 25m
2026-07-16 DAL1547 MSY → ATL Jul 16, 10:29 UTCJul 16, 11:34 UTC1h 5m
2026-07-16 DAL2224 ATL → MSY Jul 16, 03:20 UTCJul 16, 04:25 UTC1h 5m
2026-07-16 DAL2224 ATL → MSY Jul 16, 03:20 UTCJul 16, 04:24 UTC1h 4m
2026-07-15 DAL809 SJC → ATL Jul 15, 19:50 UTCJul 16, 00:20 UTC4h 30m
2026-07-15 DAL809 ATL → SJC Jul 15, 13:55 UTCJul 15, 18:05 UTC4h 10m
2026-07-14 DAL1036 MSP → ATL Jul 14, 22:30 UTCJul 15, 00:30 UTC1h 59m
2026-07-14 DAL1036 MSP → ATL Jul 14, 22:29 UTCJul 15, 00:28 UTC1h 59m

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 N951DX page for operator, model, and routing details .

Mode-S AD38BF frequently asked

What is Mode-S code AD38BF?
AD38BF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N951DX.
Where is Mode-S AD38BF registered?
Mode-S code AD38BF 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 AD38BF broadcasting right now?
Yes. Mode-S AD38BF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD38BF, octal 53234277, decimal 11,352,255.
What flights does AD38BF operate?
Mode-S AD38BF has broadcast 20 distinct callsigns, including DAL809, DAL2474, DAL2195, DAL2160, DAL3056.