Apparatus

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sensors Mode-S transponder

ADD6DB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N991FD · BOEING 757-200 · operated by FEDERAL EXPRESS CORP

Hex
ADD6DB
Octal
53353333
Decimal
11,392,731
Country
US
Tail
N991FD
Type
B752
No current signal · last broadcast 21m ago
Flights observed
131
Distinct callsigns
20
Country
US
Last broadcast
21m ago

Last known position

Most recent position reported by Mode-S ADD6DB.

Country allocation

The ICAO 24-bit address ADD6DB 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
FDX1294 FedEx Express 6 2026-06-03
FDX1451 FedEx Express 5 2026-06-04
FDX1726 - 4 2026-04-14
FDX1454 FedEx Express 4 2026-05-30
FDX1370 - 4 2026-07-14
FDX1362 FedEx Express 4 2026-06-05
FDX1254 FedEx Express 4 2026-06-02
FDX1498 FedEx Express 3 2026-05-27
FDX1488 - 3 2026-07-14
FDX1472 FedEx Express 3 2026-05-02
FDX1374 - 3 2026-06-26
FDX1335 FedEx Express 3 2026-05-21
FDX1952 FedEx Express 2 2026-05-28
FDX1777 - 2 2026-07-09
FDX1702 - 2 2026-07-08
FDX1685 FedEx Express 2 2026-04-24
FDX1677 - 2 2026-07-07
FDX1591 - 2 2026-06-30
FDX1579 FedEx Express 2 2026-05-20
FDX1578 - 2 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FDX1488 - Jul 14, 09:55 UTCJul 14, 10:30 UTC35m
2026-07-14 FDX1370 - Jul 14, 03:50 UTCJul 14, 05:35 UTC1h 45m
2026-07-14 FDX1370 - Jul 14, 02:20 UTCJul 14, 02:55 UTC35m
2026-07-11 FDX1487 - Jul 11, 12:30 UTCJul 11, 12:50 UTC20m
2026-07-11 FDX1487 - Jul 11, 09:40 UTCJul 11, 11:30 UTC1h 50m
2026-07-11 FDX1370 - Jul 11, 03:40 UTCJul 11, 05:31 UTC1h 50m
2026-07-10 FDX1370 - Jul 10, 13:05 UTCJul 11, 02:50 UTC13h 45m
2026-07-10 FDX1408 - Jul 10, 08:55 UTCJul 10, 11:10 UTC2h 15m
2026-07-10 FDX1357 - Jul 10, 01:55 UTCJul 10, 04:25 UTC2h 30m
2026-07-09 FDX1777 - Jul 9, 10:20 UTCJul 9, 10:45 UTC25m
2026-07-09 FDX1777 - Jul 9, 08:35 UTCJul 9, 09:25 UTC50m
2026-07-09 FDX1643 - Jul 9, 03:10 UTCJul 9, 03:50 UTC40m
2026-07-08 FDX1702 - Jul 8, 09:00 UTCJul 8, 09:35 UTC35m
2026-07-08 FDX1661 SLC → IND Jul 8, 02:00 UTCJul 8, 04:45 UTC2h 45m
2026-07-07 FDX1770 - Jul 7, 08:25 UTCJul 7, 11:15 UTC2h 50m
2026-07-07 FDX1677 - Jul 7, 03:30 UTCJul 7, 04:20 UTC50m
2026-07-03 FDX1464 - Jul 3, 09:10 UTCJul 3, 10:10 UTC1h 0m
2026-07-03 FDX1232 EWR → MEM Jul 3, 02:25 UTCJul 3, 04:40 UTC2h 15m
2026-07-02 FDX1901 IAD → EWR Jul 2, 03:25 UTCJul 2, 04:10 UTC45m
2026-07-01 FDX1540 - Jul 1, 09:10 UTCJul 1, 10:45 UTC1h 35m
2026-07-01 FDX2391 - Jul 1, 01:35 UTCJul 1, 03:35 UTC2h 0m
2026-06-30 FDX1591 - Jun 30, 10:05 UTCJun 30, 11:40 UTC1h 35m
2026-06-30 FDX1591 MEM → MCO Jun 30, 10:02 UTCJun 30, 11:35 UTC1h 33m
2026-06-30 FDX1320 - Jun 30, 03:50 UTCJun 30, 04:30 UTC40m
2026-06-27 FDX1457 - Jun 27, 09:29 UTCJun 27, 10:19 UTC50m
2026-06-27 FDX1296 - Jun 27, 02:04 UTCJun 27, 04:00 UTC1h 55m
2026-06-26 FDX1578 - Jun 26, 09:05 UTCJun 26, 10:50 UTC1h 45m
2026-06-26 FDX1374 - Jun 26, 02:05 UTCJun 26, 03:05 UTC1h 0m
2026-06-25 FDX1562 - Jun 25, 08:14 UTCJun 25, 09:05 UTC50m
2026-06-25 FDX1296 - Jun 25, 01:50 UTCJun 25, 03:44 UTC1h 55m
2026-06-24 FDX1578 - Jun 24, 09:05 UTCJun 24, 10:45 UTC1h 40m
2026-06-24 FDX1310 - Jun 24, 01:14 UTCJun 24, 03:24 UTC2h 10m
2026-06-23 FDX1780 - Jun 23, 08:35 UTCJun 23, 09:49 UTC1h 15m
2026-06-23 FDX1636 - Jun 23, 02:40 UTCJun 23, 04:00 UTC1h 20m
2026-06-16 FDX1736 IND → MDT Jun 16, 08:39 UTCJun 16, 09:45 UTC1h 5m
2026-06-16 FDX1662 - Jun 16, 02:15 UTCJun 16, 03:50 UTC1h 35m
2026-06-12 FDX1727 IND → ORD Jun 12, 09:25 UTCJun 12, 11:00 UTC1h 35m
2026-06-10 FDX1677 LAX → IND Jun 10, 03:40 UTCJun 10, 04:25 UTC45m
2026-06-09 FDX1464 MEM → CID Jun 9, 09:35 UTCJun 9, 10:40 UTC1h 5m
2026-06-09 FDX1382 MIA → MEM Jun 9, 03:05 UTCJun 9, 04:15 UTC1h 10m
2026-06-07 FDX982 SEA → OAK Jun 7, 22:55 UTCJun 8, 00:10 UTC1h 15m
2026-06-06 FDX1347 ALB → MEM Jun 6, 02:00 UTCJun 6, 04:20 UTC2h 20m
2026-06-05 FDX1570 MEM → ALB Jun 5, 08:30 UTCJun 5, 10:35 UTC2h 5m
2026-06-05 FDX1362 ROA → MEM Jun 5, 01:55 UTCJun 5, 03:15 UTC1h 20m
2026-06-04 FDX1451 MEM → ROA Jun 4, 09:35 UTCJun 4, 10:50 UTC1h 15m
2026-06-04 FDX1451 MEM → ROA Jun 4, 09:32 UTCJun 4, 10:47 UTC1h 15m
2026-06-04 FDX2278 MCO → MEM Jun 4, 00:55 UTCJun 4, 02:35 UTC1h 40m
2026-06-03 FDX1409 MEM → MCO Jun 3, 08:10 UTCJun 3, 09:35 UTC1h 25m
2026-06-03 FDX1294 PHL → MEM Jun 3, 01:20 UTCJun 3, 03:00 UTC1h 40m
2026-06-03 FDX1294 PHL → MEM Jun 3, 01:15 UTCJun 3, 03:05 UTC1h 50m

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 N991FD page for operator, model, and routing details .

Mode-S ADD6DB frequently asked

What is Mode-S code ADD6DB?
ADD6DB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N991FD.
Where is Mode-S ADD6DB registered?
Mode-S code ADD6DB 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 ADD6DB broadcasting right now?
No active broadcast right now. Last signal was 21m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD6DB, octal 53353333, decimal 11,392,731.
What flights does ADD6DB operate?
Mode-S ADD6DB has broadcast 20 distinct callsigns, including FDX1294, FDX1451, FDX1726, FDX1454, FDX1370.