Apparatus

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sensors Mode-S transponder

491D99

ICAO 24-bit transponder address · allocated to Portugal

Currently assigned to CS-GLY · BOMBARDIER BD-700 Global 5000/5500

Hex
491D99
Octal
22216631
Decimal
4,791,705
Country
PT
Tail
CS-GLY
Type
GL5T
Broadcasting now · callsign NJE469N · 7,000 ft
Flights observed
174
Distinct callsigns
20
Country
PT
Last broadcast
7m ago

Current position

491D99 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 491D99 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
NJE2BM - 14 2026-07-03
NJU408N - 4 2026-04-16
NJE314E - 4 2026-04-15
NJE450Y - 2 2026-06-12
NJE330P - 2 2026-06-25
NJE317K - 2 2026-07-06
NJE020T - 2 2026-06-27
NJE018W - 2 2026-05-17
NJE011B - 2 2026-06-14
NJE005L - 2 2026-05-17
NJU565A - 1 2026-05-28
NJE996Q - 1 2026-06-18
NJE993L - 1 2026-05-09
NJE992G - 1 2026-07-17
NJE980F - 1 2026-07-11
NJE970F - 1 2026-06-27
NJE967F - 1 2026-06-09
NJE935L - 1 2026-05-16
NJE927N - 1 2026-06-26
NJE925W - 1 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 NJE469N - Jul 18, 08:00 UTCJul 18, 10:15 UTC2h 15m
2026-07-18 NJE160E - Jul 18, 05:40 UTCJul 18, 07:10 UTC1h 30m
2026-07-17 NJE992G BQH → NCE Jul 17, 13:35 UTCJul 17, 15:15 UTC1h 40m
2026-07-16 NJE376L - Jul 16, 11:54 UTCJul 16, 14:05 UTC2h 10m
2026-07-16 NJE701Y - Jul 16, 09:00 UTCJul 16, 10:20 UTC1h 20m
2026-07-15 NJE064R BRI → ZRH Jul 15, 14:40 UTCJul 15, 16:30 UTC1h 50m
2026-07-15 NJE419M - Jul 15, 10:45 UTCJul 15, 13:20 UTC2h 35m
2026-07-15 NJE885C - Jul 15, 06:25 UTCJul 15, 08:30 UTC2h 5m
2026-07-14 NJE870T IBZ → AVN Jul 14, 13:10 UTCJul 14, 14:20 UTC1h 10m
2026-07-14 NJE925W - Jul 14, 11:25 UTCJul 14, 12:10 UTC45m
2026-07-14 NJE041L - Jul 14, 07:15 UTCJul 14, 08:55 UTC1h 40m
2026-07-13 NJE584A - Jul 13, 18:20 UTCJul 13, 19:35 UTC1h 15m
2026-07-13 NJE577K - Jul 13, 14:15 UTCJul 13, 15:00 UTC45m
2026-07-11 NJE980F LPL → LTN Jul 11, 18:25 UTCJul 11, 19:00 UTC35m
2026-07-11 NJE269F - Jul 11, 11:15 UTCJul 11, 17:40 UTC6h 25m
2026-07-10 NJE920R - Jul 10, 14:45 UTCJul 10, 15:55 UTC1h 10m
2026-07-06 NJE653T - Jul 6, 15:00 UTCJul 6, 23:05 UTC8h 5m
2026-07-06 NJE317K - Jul 6, 09:55 UTCJul 6, 12:40 UTC2h 45m
2026-07-05 NJE317K - Jul 5, 16:15 UTCJul 5, 17:10 UTC55m
2026-07-05 NJE713U - Jul 5, 12:10 UTCJul 5, 14:15 UTC2h 5m
2026-07-05 NJE218B - Jul 5, 09:10 UTCJul 5, 09:35 UTC25m
2026-07-05 NJE317R - Jul 5, 06:40 UTCJul 5, 07:40 UTC1h 0m
2026-07-04 NJE697Q - Jul 4, 13:10 UTCJul 4, 13:55 UTC45m
2026-07-04 NJE421T - Jul 4, 09:20 UTCJul 4, 10:25 UTC1h 5m
2026-07-03 NJE2BM - Jul 3, 16:05 UTCJul 3, 17:05 UTC1h 0m
2026-07-03 NJE709H MUC → MXP Jul 3, 13:25 UTCJul 3, 14:05 UTC40m
2026-07-02 NJE531Q ZRH → MUC Jul 2, 12:55 UTCJul 2, 13:30 UTC35m
2026-07-02 NJE465B - Jul 2, 09:50 UTCJul 2, 10:55 UTC1h 5m
2026-07-02 NJE693Y - Jul 2, 07:15 UTCJul 2, 08:40 UTC1h 25m
2026-07-01 NJE250H - Jul 1, 16:55 UTCJul 1, 17:50 UTC55m
2026-06-30 NJE327H - Jun 30, 16:45 UTCJun 30, 18:45 UTC2h 0m
2026-06-30 NJE401H DUB → BLL Jun 30, 14:40 UTCJun 30, 16:00 UTC1h 20m
2026-06-30 NJE469U - Jun 30, 10:25 UTCJun 30, 12:45 UTC2h 20m
2026-06-30 NJE279D - Jun 30, 08:05 UTCJun 30, 08:35 UTC30m
2026-06-29 NJE632M ZRH → BCN Jun 29, 14:25 UTCJun 29, 15:45 UTC1h 20m
2026-06-29 NJE260D - Jun 29, 10:55 UTCJun 29, 12:09 UTC1h 15m
2026-06-29 NJE584M NCE → KRK Jun 29, 07:20 UTCJun 29, 09:00 UTC1h 40m
2026-06-28 NJE381N - Jun 28, 14:59 UTCJun 28, 15:44 UTC45m
2026-06-28 NJE293G - Jun 28, 12:35 UTCJun 28, 13:19 UTC45m
2026-06-28 NJE894W - Jun 28, 10:44 UTCJun 28, 11:25 UTC40m
2026-06-28 NJE250K - Jun 28, 08:25 UTCJun 28, 09:30 UTC1h 5m
2026-06-27 NJE970F IBZ → BCN Jun 27, 16:00 UTCJun 27, 16:39 UTC40m
2026-06-27 NJE521G - Jun 27, 12:19 UTCJun 27, 14:20 UTC2h 0m
2026-06-27 NJE844P IBZ → FAB Jun 27, 08:20 UTCJun 27, 10:14 UTC1h 55m
2026-06-27 NJE020T - Jun 27, 06:15 UTCJun 27, 07:04 UTC50m
2026-06-26 NJE020T - Jun 26, 15:05 UTCJun 26, 16:54 UTC1h 50m
2026-06-26 NJE927N NCE → MAN Jun 26, 12:05 UTCJun 26, 13:49 UTC1h 45m
2026-06-26 NJE268R - Jun 26, 09:39 UTCJun 26, 10:15 UTC35m
2026-06-25 NJE330P - Jun 25, 15:44 UTCJun 25, 17:54 UTC2h 10m
2026-06-25 NJE330P - Jun 25, 13:35 UTCJun 25, 13:55 UTC20m

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-GLY page for operator, model, and routing details .

Mode-S 491D99 frequently asked

What is Mode-S code 491D99?
491D99 is an ICAO 24-bit transponder address. Allocated to Portugal. Assigned to CS-GLY.
Where is Mode-S 491D99 registered?
Mode-S code 491D99 is allocated to Portugal (PT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 491D99 broadcasting right now?
Yes. Mode-S 491D99 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 491D99, octal 22216631, decimal 4,791,705.
What flights does 491D99 operate?
Mode-S 491D99 has broadcast 20 distinct callsigns, including NJE2BM, NJU408N, NJE314E, NJE450Y, NJE330P.