Apparatus

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sensors Mode-S transponder

4951EF

ICAO 24-bit transponder address · allocated to Portugal

Currently assigned to CS-TOO · AIRBUS A-330-200

Hex
4951EF
Octal
22250757
Decimal
4,805,103
Country
PT
Tail
CS-TOO
Type
A332
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
191
Distinct callsigns
20
Country
PT
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 4951EF.

Country allocation

The ICAO 24-bit address 4951EF 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
TAP110 - 26 2026-07-18
TAP109 TAP Portugal 25 2026-07-26
TAP210 TAP Portugal 17 2026-07-25
TAP209K TAP Portugal 17 2026-07-24
TAP036 TAP Portugal 13 2026-05-08
TAP035 TAP Portugal 13 2026-05-07
TAP011 - 10 2026-07-10
TAP89WT TAP Portugal 9 2026-06-13
TAP203 TAP Portugal 9 2026-07-20
TAP067 TAP Portugal 9 2026-07-22
TAP3178 - 7 2026-06-16
TAP204A TAP Portugal 7 2026-07-21
TAP90EH TAP Portugal 6 2026-06-13
TAP104 - 5 2026-06-11
TAP226 - 2 2026-06-22
TAP225V - 2 2026-06-21
TAP028 - 2 2026-06-23
TAP012 - 2 2026-07-11
TAP9264 TAP Portugal 1 2026-06-05
TAP9253 - 1 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TAP109 LIS → FLN Jul 26, 12:45 UTCJul 26, 21:45 UTC9h 0m
2026-07-25 TAP210 JFK → LIS Jul 25, 03:15 UTCJul 25, 09:45 UTC6h 30m
2026-07-24 TAP209K LIS → JFK Jul 24, 16:30 UTCJul 24, 23:15 UTC6h 45m
2026-07-24 TAP210 JFK → LIS Jul 24, 02:40 UTCJul 24, 09:00 UTC6h 20m
2026-07-23 TAP209K LIS → JFK Jul 23, 16:35 UTCJul 23, 23:35 UTC7h 0m
2026-07-23 TAP210 JFK → LIS Jul 23, 02:35 UTCJul 23, 08:55 UTC6h 20m
2026-07-22 TAP209K LIS → JFK Jul 22, 16:35 UTCJul 22, 23:35 UTC7h 0m
2026-07-22 TAP067 OPO → GIG Jul 22, 03:45 UTCJul 22, 12:50 UTC9h 5m
2026-07-22 TAP067 OPO → GIG Jul 22, 00:35 UTCJul 22, 01:35 UTC1h 0m
2026-07-21 TAP067 OPO → GIG Jul 21, 12:40 UTCJul 21, 22:30 UTC9h 50m
2026-07-21 TAP204A EWR → LIS Jul 21, 03:25 UTCJul 21, 09:55 UTC6h 30m
2026-07-20 TAP203 LIS → EWR Jul 20, 17:20 UTCJul 21, 00:30 UTC7h 9m
2026-07-20 TAP204A EWR → LIS Jul 20, 04:00 UTCJul 20, 10:20 UTC6h 20m
2026-07-19 TAP203 LIS → EWR Jul 19, 17:25 UTCJul 20, 00:50 UTC7h 25m
2026-07-19 TAP067 OPO → GIG Jul 19, 05:35 UTCJul 19, 14:20 UTC8h 45m
2026-07-19 TAP067 OPO → GIG Jul 19, 03:00 UTCJul 19, 04:05 UTC1h 5m
2026-07-18 TAP067 OPO → GIG Jul 18, 15:35 UTCJul 19, 01:30 UTC9h 55m
2026-07-18 TAP110 - Jul 18, 03:40 UTCJul 18, 13:20 UTC9h 40m
2026-07-17 TAP109 - Jul 17, 12:15 UTCJul 17, 22:29 UTC10h 15m
2026-07-17 TAP204A EWR → LIS Jul 17, 03:39 UTCJul 17, 10:00 UTC6h 20m
2026-07-16 TAP203 LIS → EWR Jul 16, 17:40 UTCJul 17, 01:09 UTC7h 30m
2026-07-16 TAP110 - Jul 16, 01:15 UTCJul 16, 10:59 UTC9h 45m
2026-07-15 TAP109 - Jul 15, 13:00 UTCJul 15, 23:20 UTC10h 20m
2026-07-15 TAP210 JFK → LIS Jul 15, 02:25 UTCJul 15, 08:45 UTC6h 20m
2026-07-14 TAP209K LIS → JFK Jul 14, 16:40 UTCJul 14, 23:35 UTC6h 54m
2026-07-14 TAP110 - Jul 14, 03:00 UTCJul 14, 12:45 UTC9h 45m
2026-07-13 TAP109 - Jul 13, 13:00 UTCJul 13, 23:25 UTC10h 25m
2026-07-13 TAP210 JFK → LIS Jul 13, 03:05 UTCJul 13, 09:25 UTC6h 20m
2026-07-12 TAP209K LIS → JFK Jul 12, 16:40 UTCJul 12, 23:40 UTC7h 0m
2026-07-12 TAP067 - Jul 12, 02:30 UTCJul 12, 11:30 UTC9h 0m
2026-07-11 TAP067 - Jul 11, 23:50 UTCJul 12, 00:55 UTC1h 5m
2026-07-11 TAP067 - Jul 11, 11:15 UTCJul 11, 21:20 UTC10h 5m
2026-07-11 TAP012 - Jul 11, 01:45 UTCJul 11, 08:30 UTC6h 45m
2026-07-10 TAP011 - Jul 10, 23:35 UTCJul 10, 23:55 UTC20m
2026-07-10 TAP011 - Jul 10, 16:35 UTCJul 10, 18:25 UTC1h 50m
2026-07-08 TAP9253 EWR → LIS Jul 8, 16:40 UTCJul 8, 22:55 UTC6h 15m
2026-06-27 TAP203 LIS → EWR Jun 27, 17:14 UTCJun 28, 00:50 UTC7h 35m
2026-06-27 TAP110 - Jun 27, 03:44 UTCJun 27, 13:55 UTC10h 10m
2026-06-26 TAP109 - Jun 26, 12:39 UTCJun 26, 22:25 UTC9h 45m
2026-06-26 TAP210 - Jun 26, 03:15 UTCJun 26, 09:24 UTC6h 10m
2026-06-25 TAP209K LIS → JFK Jun 25, 16:39 UTCJun 25, 23:55 UTC7h 15m
2026-06-25 TAP204A EWR → LIS Jun 25, 03:44 UTCJun 25, 09:45 UTC6h 0m
2026-06-24 TAP203 - Jun 24, 17:25 UTCJun 25, 00:55 UTC7h 30m
2026-06-23 TAP028 LIS → LIS Jun 23, 16:59 UTCJun 24, 10:45 UTC17h 45m
2026-06-22 TAP226 - Jun 22, 04:44 UTCJun 22, 12:30 UTC7h 45m
2026-06-21 TAP225V - Jun 21, 17:50 UTCJun 22, 02:10 UTC8h 20m
2026-06-21 TAP210 JFK → LIS Jun 21, 02:40 UTCJun 21, 08:40 UTC6h 0m
2026-06-20 TAP209K LIS → JFK Jun 20, 16:34 UTCJun 20, 23:50 UTC7h 15m
2026-06-19 TAP110 - Jun 19, 13:59 UTCJun 20, 13:44 UTC23h 45m
2026-06-19 TAP109 - Jun 19, 12:49 UTCJun 20, 07:24 UTC18h 35m

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

Mode-S 4951EF frequently asked

What is Mode-S code 4951EF?
4951EF is an ICAO 24-bit transponder address. Allocated to Portugal. Assigned to CS-TOO.
Where is Mode-S 4951EF registered?
Mode-S code 4951EF is allocated to Portugal (PT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4951EF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4951EF, octal 22250757, decimal 4,805,103.
What flights does 4951EF operate?
Mode-S 4951EF has broadcast 20 distinct callsigns, including TAP110, TAP109, TAP210, TAP209K, TAP036.