Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

491D81

ICAO 24-bit transponder address · allocated to Portugal

Currently assigned to CS-GLA · BOMBARDIER BD-700 Global 6000/6500

Hex
491D81
Octal
22216601
Decimal
4,791,681
Country
PT
Tail
CS-GLA
Type
GLEX
No current signal · last broadcast Jul 24, 15:15 UTC
Flights observed
107
Distinct callsigns
20
Country
PT
Last broadcast
Jul 24, 15:15 UTC

Last known position

Most recent position reported by Mode-S 491D81.

Country allocation

The ICAO 24-bit address 491D81 falls within the block assigned to Portugal (PT) by ICAO Annex 10, Volume III. Every aircraft registered in Portugal 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
NJE2KX - 12 2026-07-20
NJE979K - 2 2026-05-29
NJE753N - 2 2026-07-14
NJE730Y - 2 2026-05-28
NJE452Y - 2 2026-05-04
NJE247F - 2 2026-07-18
NJE233A - 2 2026-06-06
NJE216R - 2 2026-05-12
NJE174A - 2 2026-07-05
NJE098F - 2 2026-06-11
NJE993U - 1 2026-05-31
NJE942K - 1 2026-04-29
NJE921R - 1 2026-07-01
NJE900P - 1 2026-07-13
NJE881N - 1 2026-07-24
NJE869B - 1 2026-05-14
NJE866M - 1 2026-05-05
NJE846E - 1 2026-05-17
NJE812Q - 1 2026-05-15
NJE811N - 1 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 NJE095D NCE → NCE Jul 24, 14:20 UTCJul 24, 15:10 UTC50m
2026-07-24 NJE500N - Jul 24, 10:40 UTCJul 24, 12:30 UTC1h 50m
2026-07-24 NJE881N NCE → RKE Jul 24, 07:30 UTCJul 24, 09:25 UTC1h 55m
2026-07-23 NJE811N - Jul 23, 14:40 UTCJul 23, 15:15 UTC35m
2026-07-23 NJE158P - Jul 23, 07:15 UTCJul 23, 07:45 UTC30m
2026-07-22 NJE254V - Jul 22, 13:55 UTCJul 22, 15:00 UTC1h 5m
2026-07-20 NJE2KX - Jul 20, 22:05 UTCJul 20, 22:15 UTC10m
2026-07-20 NJE2KX LIN → LBG Jul 20, 18:35 UTCJul 20, 19:40 UTC1h 5m
2026-07-20 NJE393U PMO → LIN Jul 20, 12:15 UTCJul 20, 13:35 UTC1h 20m
2026-07-20 NJE342D PHL → PMO Jul 20, 02:10 UTCJul 20, 10:20 UTC8h 10m
2026-07-18 NJE2KX - Jul 18, 20:05 UTCJul 18, 20:50 UTC45m
2026-07-18 NJE247F - Jul 18, 09:45 UTCJul 18, 18:15 UTC8h 30m
2026-07-17 NJE247F - Jul 17, 13:05 UTCJul 17, 13:45 UTC40m
2026-07-17 NJE2KX LIN → OLB Jul 17, 07:14 UTCJul 17, 08:00 UTC45m
2026-07-16 NJE539E - Jul 16, 11:54 UTCJul 16, 13:20 UTC1h 25m
2026-07-16 NJE163K - Jul 16, 08:05 UTCJul 16, 10:25 UTC2h 20m
2026-07-15 NJE2KX - Jul 15, 16:30 UTCJul 15, 16:55 UTC25m
2026-07-15 NJE554C - Jul 15, 12:35 UTCJul 15, 15:15 UTC2h 40m
2026-07-14 NJE753N - Jul 14, 18:20 UTCJul 14, 19:10 UTC50m
2026-07-14 NJE753N - Jul 14, 14:35 UTCJul 14, 17:25 UTC2h 50m
2026-07-14 NJE537L - Jul 14, 10:55 UTCJul 14, 13:05 UTC2h 10m
2026-07-13 NJE302E - Jul 13, 14:45 UTCJul 13, 16:15 UTC1h 30m
2026-07-13 NJE900P IBZ → AMS Jul 13, 10:10 UTCJul 13, 12:10 UTC2h 0m
2026-07-13 NJE392V - Jul 13, 08:15 UTCJul 13, 09:00 UTC45m
2026-07-05 NJE174A - Jul 5, 15:00 UTCJul 5, 18:05 UTC3h 5m
2026-07-05 NJE612R - Jul 5, 11:30 UTCJul 5, 13:00 UTC1h 30m
2026-07-05 NJE174A - Jul 5, 07:45 UTCJul 5, 10:00 UTC2h 15m
2026-07-01 NJE921R - Jul 1, 06:40 UTCJul 1, 10:55 UTC4h 15m
2026-07-01 NJE483Y - Jul 1, 04:30 UTCJul 1, 05:45 UTC1h 15m
2026-06-30 NJE560M - Jun 30, 10:30 UTCJun 30, 14:05 UTC3h 35m
2026-06-29 NJE2KX - Jun 29, 13:14 UTCJun 29, 14:29 UTC1h 15m
2026-06-19 NJE656U - Jun 19, 14:39 UTCJun 19, 14:54 UTC15m
2026-06-19 NJE688B VCE → LTN Jun 19, 10:54 UTCJun 19, 12:34 UTC1h 40m
2026-06-19 NJE452E - Jun 19, 08:20 UTCJun 19, 09:04 UTC45m
2026-06-19 NJE431E - Jun 19, 06:49 UTCJun 19, 07:29 UTC40m
2026-06-11 NJE269M - Jun 11, 06:20 UTCJun 11, 07:15 UTC55m
2026-06-11 NJE098F - Jun 11, 03:50 UTCJun 11, 05:15 UTC1h 25m
2026-06-10 NJE559C - Jun 10, 13:30 UTCJun 10, 15:35 UTC2h 5m
2026-06-10 NJE522Q LIN → ATH Jun 10, 08:20 UTCJun 10, 10:15 UTC1h 55m
2026-06-09 NJE2KX OLB → LIN Jun 9, 13:15 UTCJun 9, 14:05 UTC50m
2026-06-09 NJE2KX LIN → OLB Jun 9, 11:20 UTCJun 9, 12:10 UTC50m
2026-06-08 NJE602R - Jun 8, 15:40 UTCJun 8, 16:05 UTC25m
2026-06-08 NJE410T - Jun 8, 11:20 UTCJun 8, 14:05 UTC2h 45m
2026-06-08 NJE387Q - Jun 8, 07:50 UTCJun 8, 09:15 UTC1h 25m
2026-06-07 NJE375E AYT → SOF Jun 7, 09:10 UTCJun 7, 10:35 UTC1h 25m
2026-06-07 NJE781C - Jun 7, 05:30 UTCJun 7, 07:40 UTC2h 10m
2026-06-06 NJE2KX - Jun 6, 14:59 UTCJun 6, 16:24 UTC1h 25m
2026-06-06 NJE233A - Jun 6, 11:25 UTCJun 6, 13:49 UTC2h 25m
2026-06-05 NJE233A - Jun 5, 12:35 UTCJun 5, 14:45 UTC2h 10m
2026-06-05 NJE294B - Jun 5, 10:15 UTCJun 5, 11:05 UTC50m

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 CS-GLA page for operator, model, and routing details .

Mode-S 491D81 frequently asked

What is Mode-S code 491D81?
491D81 is an ICAO 24-bit transponder address. Allocated to Portugal. Assigned to CS-GLA.
Where is Mode-S 491D81 registered?
Mode-S code 491D81 is allocated to Portugal (PT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 491D81 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 15:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 491D81, octal 22216601, decimal 4,791,681.
What flights does 491D81 operate?
Mode-S 491D81 has broadcast 20 distinct callsigns, including NJE2KX, NJE979K, NJE753N, NJE730Y, NJE452Y.