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sensors Mode-S transponder

3C4B23

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-ABYC · BOEING 747-8

Hex
3C4B23
Octal
17045443
Decimal
3,951,395
Country
DE
Tail
D-ABYC
Type
B748
Broadcasting now · callsign DLH456 · 21,125 ft
Flights observed
121
Distinct callsigns
20
Country
DE
Last broadcast
4h ago

Current position

3C4B23 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 3C4B23 falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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
DLH506 - 9 2026-07-15
DLH507 - 8 2026-07-16
DLH463 - 8 2026-06-24
DLH462 Lufthansa 8 2026-06-24
DLH431 - 8 2026-06-29
DLH430 Lufthansa 8 2026-06-29
DLH573 Lufthansa 7 2026-06-12
DLH572 Lufthansa 7 2026-06-11
DLH499 - 6 2026-07-15
DLH498 - 6 2026-07-14
DLH455 - 6 2026-07-12
DLH454 - 6 2026-07-12
DLH457 - 5 2026-06-15
DLH456 Lufthansa 5 2026-06-15
DLH7K - 4 2026-07-17
DLH423 - 4 2026-07-17
DLH403 - 4 2026-07-13
DLH402 - 4 2026-07-13
DLH3W - 2 2026-06-30
DLH9911 - 1 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 DLH423 BOS → FRA Jul 17, 23:00 UTCJul 18, 05:35 UTC6h 36m
2026-07-17 DLH7K FRA → BOS Jul 17, 12:15 UTCJul 17, 19:25 UTC7h 10m
2026-07-16 DLH507 - Jul 16, 22:00 UTCJul 17, 08:40 UTC10h 40m
2026-07-15 DLH506 - Jul 15, 20:35 UTCJul 16, 08:10 UTC11h 35m
2026-07-15 DLH499 - Jul 15, 02:30 UTCJul 15, 12:55 UTC10h 25m
2026-07-14 DLH498 FRA → MEX Jul 14, 12:35 UTCJul 14, 23:35 UTC10h 59m
2026-07-13 DLH403 - Jul 13, 22:30 UTCJul 14, 05:30 UTC7h 0m
2026-07-13 DLH402 - Jul 13, 12:25 UTCJul 13, 19:55 UTC7h 30m
2026-07-12 DLH455 SFO → FRA Jul 12, 22:25 UTCJul 13, 08:20 UTC9h 55m
2026-07-12 DLH454 - Jul 12, 08:55 UTCJul 12, 20:05 UTC11h 10m
2026-07-11 DLH499 - Jul 11, 02:20 UTCJul 11, 12:45 UTC10h 25m
2026-07-10 DLH498 - Jul 10, 12:05 UTCJul 10, 23:15 UTC11h 10m
2026-07-09 DLH507 - Jul 9, 21:30 UTCJul 10, 08:10 UTC10h 40m
2026-07-08 DLH506 - Jul 8, 20:30 UTCJul 9, 07:30 UTC11h 0m
2026-07-08 DLH499 - Jul 8, 02:35 UTCJul 8, 13:00 UTC10h 25m
2026-07-07 DLH498 FRA → MEX Jul 7, 12:05 UTCJul 7, 23:15 UTC11h 10m
2026-07-06 DLH455 - Jul 6, 22:45 UTCJul 7, 08:25 UTC9h 40m
2026-07-06 DLH454 FRA → SFO Jul 6, 09:00 UTCJul 6, 19:50 UTC10h 50m
2026-07-05 DLH423 - Jul 5, 22:30 UTCJul 6, 04:40 UTC6h 10m
2026-07-05 DLH7K FRA → BOS Jul 5, 11:55 UTCJul 5, 19:25 UTC7h 30m
2026-07-04 DLH507 - Jul 4, 22:05 UTCJul 5, 09:00 UTC10h 55m
2026-07-03 DLH506 FRA → GRU Jul 3, 20:40 UTCJul 4, 07:50 UTC11h 10m
2026-07-02 DLH423 BOS → FRA Jul 2, 23:10 UTCJul 3, 05:10 UTC6h 0m
2026-07-02 DLH7K - Jul 2, 12:30 UTCJul 2, 19:50 UTC7h 20m
2026-07-01 DLH455 - Jul 1, 22:30 UTCJul 2, 08:20 UTC9h 50m
2026-07-01 DLH454 FRA → SFO Jul 1, 09:15 UTCJul 1, 19:50 UTC10h 35m
2026-06-30 DLH419 IAD → FRA Jun 30, 22:40 UTCJul 1, 05:40 UTC7h 0m
2026-06-30 DLH3W FRA → IAD Jun 30, 12:40 UTCJun 30, 20:25 UTC7h 45m
2026-06-29 DLH431 - Jun 29, 22:49 UTCJun 30, 06:20 UTC7h 30m
2026-06-29 DLH430 FRA → ORD Jun 29, 10:29 UTCJun 29, 18:55 UTC8h 25m
2026-06-28 DLH431 ORD → FRA Jun 28, 21:45 UTCJun 29, 05:15 UTC7h 30m
2026-06-28 DLH430 FRA → ORD Jun 28, 10:00 UTCJun 28, 18:10 UTC8h 10m
2026-06-27 DLH9911 - Jun 27, 12:19 UTCJun 27, 13:20 UTC1h 0m
2026-06-26 DLH3W - Jun 26, 12:05 UTCJun 26, 12:50 UTC45m
2026-06-25 DLH431 ORD → FRA Jun 25, 22:14 UTCJun 26, 05:44 UTC7h 30m
2026-06-25 DLH430 FRA → ORD Jun 25, 09:50 UTCJun 25, 18:15 UTC8h 25m
2026-06-24 DLH463 - Jun 24, 21:19 UTCJun 25, 05:25 UTC8h 5m
2026-06-24 DLH462 FRA → MIA Jun 24, 09:29 UTCJun 24, 18:50 UTC9h 20m
2026-06-22 DLH455 SFO → FRA Jun 22, 22:44 UTCJun 23, 08:39 UTC9h 55m
2026-06-22 DLH454 FRA → SFO Jun 22, 09:19 UTCJun 22, 20:10 UTC10h 50m
2026-06-21 DLH431 - Jun 21, 22:34 UTCJun 22, 06:05 UTC7h 30m
2026-06-21 DLH430 FRA → ORD Jun 21, 09:15 UTCJun 21, 17:45 UTC8h 30m
2026-06-20 DLH403 EWR → FRA Jun 20, 22:50 UTCJun 21, 05:25 UTC6h 35m
2026-06-20 DLH402 FRA → EWR Jun 20, 12:34 UTCJun 20, 20:25 UTC7h 50m
2026-06-19 DLH507 - Jun 19, 21:49 UTCJun 20, 08:29 UTC10h 40m
2026-06-18 DLH506 FRA → GRU Jun 18, 20:30 UTCJun 19, 07:54 UTC11h 24m
2026-06-17 DLH507 - Jun 17, 21:45 UTCJun 18, 08:15 UTC10h 30m
2026-06-16 DLH506 FRA → GRU Jun 16, 20:30 UTCJun 17, 07:35 UTC11h 5m
2026-06-15 DLH457 - Jun 15, 22:49 UTCJun 16, 09:15 UTC10h 25m
2026-06-15 DLH456 FRA → LAX Jun 15, 09:30 UTCJun 15, 19:55 UTC10h 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 D-ABYC page for operator, model, and routing details .

Mode-S 3C4B23 frequently asked

What is Mode-S code 3C4B23?
3C4B23 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-ABYC.
Where is Mode-S 3C4B23 registered?
Mode-S code 3C4B23 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C4B23 broadcasting right now?
Yes. Mode-S 3C4B23 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C4B23, octal 17045443, decimal 3,951,395.
What flights does 3C4B23 operate?
Mode-S 3C4B23 has broadcast 20 distinct callsigns, including DLH506, DLH507, DLH463, DLH462, DLH431.