Apparatus

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sensors Mode-S transponder

4CC581

ICAO 24-bit transponder address

Currently assigned to TF-IAD · AIRBUS A-321neo

Hex
4CC581
Octal
23142601
Decimal
5,031,297
Tail
TF-IAD
Type
A21N
No current signal · last broadcast Jul 26, 18:25 UTC
Flights observed
377
Distinct callsigns
20
Country
-
Last broadcast
Jul 26, 18:25 UTC

Last known position

Most recent position reported by Mode-S 4CC581.

Callsign history 20 distinct

Callsign Airline Flights Last seen
ICE664 Icelandair 20 2026-07-08
ICE665 Icelandair 19 2026-07-22
ICE689 Icelandair 16 2026-07-25
ICE623 Icelandair 14 2026-07-18
ICE622 Icelandair 14 2026-07-19
ICE501 Icelandair 14 2026-07-19
ICE500 Icelandair 14 2026-07-19
ICE820 Icelandair 13 2026-05-18
ICE662 Icelandair 13 2026-07-23
ICE615 Icelandair 13 2026-07-24
ICE614 Icelandair 13 2026-07-25
ICE686 Icelandair 12 2026-07-26
ICE663 - 10 2026-07-07
ICE821 Icelandair 9 2026-05-17
ICE99K Icelandair 8 2026-07-26
ICE98C Icelandair 8 2026-07-26
ICE580 Icelandair 8 2026-07-23
ICE451 - 8 2026-06-18
ICE8K - 7 2026-07-09
ICE7J - 7 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ICE99K CPH → KEF Jul 26, 15:20 UTCJul 26, 18:15 UTC2h 55m
2026-07-26 ICE98C KEF → CPH Jul 26, 11:20 UTCJul 26, 14:00 UTC2h 40m
2026-07-26 ICE686 MCO → KEF Jul 26, 02:45 UTCJul 26, 09:35 UTC6h 51m
2026-07-25 ICE689 KEF → MCO Jul 25, 20:30 UTCJul 26, 00:15 UTC3h 45m
2026-07-25 ICE689 KEF → MCO Jul 25, 17:00 UTCJul 25, 17:15 UTC15m
2026-07-25 ICE307 ARN → KEF Jul 25, 12:00 UTCJul 25, 14:50 UTC2h 50m
2026-07-25 ICE306 KEF → ARN Jul 25, 08:00 UTCJul 25, 10:35 UTC2h 35m
2026-07-25 ICE614 JFK → KEF Jul 25, 01:50 UTCJul 25, 06:45 UTC4h 55m
2026-07-24 ICE615 KEF → JFK Jul 24, 17:40 UTCJul 24, 23:25 UTC5h 45m
2026-07-24 ICE537 MUC → KEF Jul 24, 12:15 UTCJul 24, 16:10 UTC3h 55m
2026-07-24 ICE536 KEF → MUC Jul 24, 07:40 UTCJul 24, 10:45 UTC3h 5m
2026-07-23 ICE581 TFS → KEF Jul 23, 17:55 UTCJul 23, 22:55 UTC5h 0m
2026-07-23 ICE580 KEF → TFS Jul 23, 14:55 UTCJul 23, 16:10 UTC1h 15m
2026-07-23 ICE580 KEF → TFS Jul 23, 11:25 UTCJul 23, 11:45 UTC20m
2026-07-23 ICE662 PDX → KEF Jul 23, 09:40 UTCJul 23, 10:00 UTC20m
2026-07-23 ICE662 PDX → KEF Jul 23, 03:10 UTCJul 23, 06:45 UTC3h 35m
2026-07-22 ICE665 KEF → PDX Jul 22, 17:50 UTCJul 23, 01:35 UTC7h 45m
2026-07-22 ICE5BK BGO → KEF Jul 22, 13:30 UTCJul 22, 16:15 UTC2h 45m
2026-07-22 ICE4BE KEF → BGO Jul 22, 11:50 UTCJul 22, 12:25 UTC35m
2026-07-22 ICE202 KEF → CPH Jul 22, 02:05 UTCJul 22, 04:45 UTC2h 40m
2026-07-21 ICE473 LGW → KEF Jul 21, 15:25 UTCJul 21, 18:20 UTC2h 55m
2026-07-21 ICE472 KEF → LGW Jul 21, 11:10 UTCJul 21, 13:45 UTC2h 35m
2026-07-21 ICE201 CPH → KEF Jul 21, 05:40 UTCJul 21, 08:50 UTC3h 10m
2026-07-21 ICE202 KEF → CPH Jul 21, 01:10 UTCJul 21, 03:45 UTC2h 35m
2026-07-20 ICE99K CPH → KEF Jul 20, 16:30 UTCJul 20, 19:35 UTC3h 5m
2026-07-20 ICE98C - Jul 20, 12:20 UTCJul 20, 15:00 UTC2h 40m
2026-07-20 ICE662 PDX → KEF Jul 20, 10:25 UTCJul 20, 10:45 UTC20m
2026-07-20 ICE662 PDX → KEF Jul 20, 03:40 UTCJul 20, 05:40 UTC2h 0m
2026-07-19 ICE665 KEF → PDX Jul 19, 18:50 UTCJul 20, 02:25 UTC7h 35m
2026-07-19 ICE501 AMS → KEF Jul 19, 14:35 UTCJul 19, 17:25 UTC2h 50m
2026-07-19 ICE500 KEF → AMS Jul 19, 10:10 UTCJul 19, 12:30 UTC2h 20m
2026-07-19 ICE622 EWR → KEF Jul 19, 03:40 UTCJul 19, 08:40 UTC5h 0m
2026-07-18 ICE623 KEF → EWR Jul 18, 20:45 UTCJul 18, 23:05 UTC2h 20m
2026-07-18 ICE623 KEF → EWR Jul 18, 17:15 UTCJul 18, 17:35 UTC20m
2026-07-18 ICE5BK BGO → KEF Jul 18, 13:35 UTCJul 18, 15:50 UTC2h 15m
2026-07-18 ICE4BE KEF → BGO Jul 18, 10:25 UTCJul 18, 12:20 UTC1h 55m
2026-07-18 ICE201 CPH → KEF Jul 18, 05:35 UTCJul 18, 08:35 UTC3h 0m
2026-07-18 ICE202 KEF → CPH Jul 18, 01:10 UTCJul 18, 03:50 UTC2h 41m
2026-07-17 ICE99K CPH → KEF Jul 17, 15:15 UTCJul 17, 18:25 UTC3h 10m
2026-07-17 ICE98C KEF → CPH Jul 17, 11:00 UTCJul 17, 13:40 UTC2h 40m
2026-07-17 ICE686 MCO → KEF Jul 17, 02:50 UTCJul 17, 09:30 UTC6h 40m
2026-07-16 ICE689 KEF → MCO Jul 16, 21:30 UTCJul 17, 00:30 UTC3h 0m
2026-07-16 ICE689 - Jul 16, 17:20 UTCJul 16, 17:40 UTC20m
2026-07-16 ICE501 - Jul 16, 13:00 UTCJul 16, 15:49 UTC2h 50m
2026-07-16 ICE500 KEF → AMS Jul 16, 08:25 UTCJul 16, 11:10 UTC2h 45m
2026-07-16 ICE622 - Jul 16, 05:40 UTCJul 16, 06:05 UTC25m
2026-07-16 ICE622 - Jul 16, 01:05 UTCJul 16, 02:35 UTC1h 30m
2026-07-15 ICE623 KEF → EWR Jul 15, 17:35 UTCJul 15, 23:10 UTC5h 35m
2026-07-15 ICE343 HEL → KEF Jul 15, 12:20 UTCJul 15, 15:40 UTC3h 20m
2026-07-15 ICE342 - Jul 15, 08:05 UTCJul 15, 11:05 UTC3h 0m

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 TF-IAD page for operator, model, and routing details .

Mode-S 4CC581 frequently asked

What is Mode-S code 4CC581?
4CC581 is an ICAO 24-bit transponder address. Assigned to TF-IAD.
Is 4CC581 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CC581, octal 23142601, decimal 5,031,297.
What flights does 4CC581 operate?
Mode-S 4CC581 has broadcast 20 distinct callsigns, including ICE664, ICE665, ICE689, ICE623, ICE622.