Apparatus

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sensors Mode-S transponder

A4BC76

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N404KZ · BOEING 747-400 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A4BC76
Octal
51136166
Decimal
10,796,150
Country
US
Tail
N404KZ
Type
B744
No current signal · last broadcast 8h ago
Flights observed
163
Distinct callsigns
20
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A4BC76.

Country allocation

The ICAO 24-bit address A4BC76 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
GTI7134 - 46 2026-07-10
GTI7143 - 21 2026-07-11
GTI7172 - 16 2026-06-24
GTI7103 - 10 2026-07-09
GTI7171 - 9 2026-06-24
GTI7138 Atlas Air 8 2026-06-03
GTI7243 - 6 2026-07-12
GTI7106 - 6 2026-07-09
GTI7244 - 5 2026-07-13
GTI7147 Atlas Air 4 2026-06-04
GTI7108 - 3 2026-07-13
GTI7101 - 3 2026-07-14
GTI4607 - 3 2026-06-19
GTI4008 - 3 2026-06-16
GTI8523 Atlas Air 2 2026-05-18
GTI7145 - 2 2026-06-20
GTI7136 - 2 2026-06-19
GTI7132 Atlas Air 2 2026-05-20
GTI2177 Atlas Air 2 2026-04-13
GTI9704 Atlas Air 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GTI7101 - Jul 14, 00:05 UTCJul 14, 01:05 UTC1h 0m
2026-07-13 GTI7108 - Jul 13, 10:55 UTCJul 13, 21:10 UTC10h 15m
2026-07-13 GTI7244 - Jul 13, 05:10 UTCJul 13, 08:15 UTC3h 5m
2026-07-12 GTI7243 - Jul 12, 22:35 UTCJul 13, 01:25 UTC2h 50m
2026-07-11 GTI7143 - Jul 11, 09:35 UTCJul 11, 21:25 UTC11h 50m
2026-07-10 GTI7134 ANC → ORD Jul 10, 22:45 UTCJul 11, 04:10 UTC5h 25m
2026-07-10 GTI7134 - Jul 10, 13:20 UTCJul 10, 19:55 UTC6h 35m
2026-07-09 GTI7103 - Jul 9, 22:40 UTCJul 10, 09:40 UTC11h 0m
2026-07-09 GTI7106 - Jul 9, 10:20 UTCJul 9, 20:10 UTC9h 50m
2026-07-09 GTI9181 ICN → NRT Jul 9, 05:15 UTCJul 9, 07:25 UTC2h 10m
2026-07-04 GTI9180 - Jul 4, 23:10 UTCJul 5, 01:15 UTC2h 5m
2026-07-04 GTI7143 ORD → NRT Jul 4, 09:20 UTCJul 4, 21:05 UTC11h 45m
2026-07-03 GTI7134 ANC → ORD Jul 3, 22:35 UTCJul 4, 05:10 UTC6h 35m
2026-07-03 GTI7134 - Jul 3, 13:20 UTCJul 3, 19:30 UTC6h 10m
2026-07-02 GTI7103 - Jul 2, 23:10 UTCJul 3, 10:20 UTC11h 10m
2026-07-02 GTI7106 - Jul 2, 10:25 UTCJul 2, 19:35 UTC9h 10m
2026-07-01 GTI7143 ORD → NRT Jul 1, 09:20 UTCJul 1, 21:25 UTC12h 5m
2026-06-30 GTI7134 ANC → ORD Jun 30, 19:05 UTCJul 1, 00:55 UTC5h 50m
2026-06-30 GTI7134 - Jun 30, 10:45 UTCJun 30, 16:55 UTC6h 10m
2026-06-30 GTI7244 TPE → NRT Jun 30, 05:20 UTCJun 30, 08:00 UTC2h 40m
2026-06-29 GTI7243 - Jun 29, 22:49 UTCJun 30, 01:50 UTC3h 1m
2026-06-28 GTI7143 - Jun 28, 09:30 UTCJun 28, 21:45 UTC12h 15m
2026-06-26 GTI7134 ANC → ORD Jun 26, 22:14 UTCJun 27, 03:34 UTC5h 20m
2026-06-26 GTI7134 NRT → ANC Jun 26, 13:30 UTCJun 26, 19:45 UTC6h 15m
2026-06-25 GTI7103 - Jun 25, 23:05 UTCJun 26, 10:15 UTC11h 10m
2026-06-25 GTI7106 - Jun 25, 10:25 UTCJun 25, 19:29 UTC9h 5m
2026-06-24 GTI7171 DFW → NRT Jun 24, 17:14 UTCJun 25, 05:44 UTC12h 30m
2026-06-24 GTI7172 ANC → DFW Jun 24, 08:20 UTCJun 24, 14:00 UTC5h 40m
2026-06-23 GTI7172 - Jun 23, 23:59 UTCJun 24, 06:35 UTC6h 35m
2026-06-23 GTI7143 - Jun 23, 09:34 UTCJun 23, 21:29 UTC11h 55m
2026-06-23 GTI7134 - Jun 23, 04:09 UTCJun 23, 06:09 UTC2h 0m
2026-06-23 GTI7134 - Jun 23, 00:30 UTCJun 23, 01:25 UTC55m
2026-06-22 GTI7134 - Jun 22, 13:59 UTCJun 22, 20:34 UTC6h 35m
2026-06-21 GTI7171 DFW → NRT Jun 21, 23:14 UTCJun 22, 11:24 UTC12h 10m
2026-06-21 GTI7172 ANC → DFW Jun 21, 12:49 UTCJun 21, 18:25 UTC5h 35m
2026-06-21 GTI7172 - Jun 21, 04:20 UTCJun 21, 10:49 UTC6h 30m
2026-06-20 GTI7145 ORD → NRT Jun 20, 09:09 UTCJun 20, 21:10 UTC12h 0m
2026-06-19 GTI7136 ANC → ORD Jun 19, 22:24 UTCJun 20, 03:44 UTC5h 20m
2026-06-19 GTI7136 - Jun 19, 13:44 UTCJun 19, 20:09 UTC6h 25m
2026-06-19 GTI4607 ANC → NRT Jun 19, 04:25 UTCJun 19, 11:09 UTC6h 45m
2026-06-18 GTI4607 - Jun 18, 18:05 UTCJun 19, 02:09 UTC8h 4m
2026-06-17 GTI4607 - Jun 17, 07:35 UTCJun 17, 15:05 UTC7h 30m
2026-06-16 GTI4008 - Jun 16, 20:50 UTCJun 17, 04:05 UTC7h 15m
2026-06-16 GTI4008 - Jun 16, 09:10 UTCJun 16, 15:50 UTC6h 40m
2026-06-15 GTI4008 - Jun 15, 13:50 UTCJun 16, 06:20 UTC16h 30m
2026-06-14 GTI7145 - Jun 14, 08:50 UTCJun 14, 21:15 UTC12h 25m
2026-06-13 GTI7134 ANC → ORD Jun 13, 23:50 UTCJun 14, 05:05 UTC5h 16m
2026-06-13 GTI7134 ANC → ORD Jun 13, 13:15 UTCJun 13, 19:35 UTC6h 20m
2026-06-12 GTI7171 DFW → NRT Jun 12, 21:25 UTCJun 13, 09:55 UTC12h 29m
2026-06-12 GTI7172 ANC → DFW Jun 12, 12:25 UTCJun 12, 17:50 UTC5h 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 N404KZ page for operator, model, and routing details .

Mode-S A4BC76 frequently asked

What is Mode-S code A4BC76?
A4BC76 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N404KZ.
Where is Mode-S A4BC76 registered?
Mode-S code A4BC76 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 A4BC76 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BC76, octal 51136166, decimal 10,796,150.
What flights does A4BC76 operate?
Mode-S A4BC76 has broadcast 20 distinct callsigns, including GTI7134, GTI7143, GTI7172, GTI7103, GTI7171.