Apparatus

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sensors Mode-S transponder

4CC279

ICAO 24-bit transponder address · allocated to Iceland

Currently assigned to TF-ISO · BOEING 767-300

Hex
4CC279
Octal
23141171
Decimal
5,030,521
Country
IS
Tail
TF-ISO
Type
B763
No current signal · last broadcast 5h ago
Flights observed
157
Distinct callsigns
20
Country
IS
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4CC279.

Country allocation

The ICAO 24-bit address 4CC279 falls within the block assigned to Iceland (IS) by ICAO Annex 10, Volume III. Every aircraft registered in Iceland 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
ICE630 Icelandair 36 2026-05-30
ICE631 Icelandair 30 2026-05-29
ICE205 Icelandair 16 2026-05-29
ICE204 Icelandair 16 2026-05-29
ICE8K Icelandair 15 2026-05-30
ICE7J Icelandair 14 2026-05-30
ICE451 Icelandair 4 2026-05-27
ICE450 Icelandair 4 2026-05-27
ICE501 Icelandair 3 2026-05-02
ICE500 Icelandair 3 2026-05-02
ICE63L Icelandair 2 2026-05-28
ICE62L Icelandair 2 2026-05-28
ICE319 Icelandair 2 2026-04-16
ICE318 Icelandair 2 2026-04-16
ICE76V Icelandair 1 2026-05-12
ICE75T Icelandair 1 2026-05-12
ICE597 Icelandair 1 2026-04-23
ICE596 Icelandair 1 2026-04-23
ICE455 Icelandair 1 2026-05-13
ICE454 Icelandair 1 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ICE7J CDG → KEF May 30, 13:20 UTCMay 30, 16:05 UTC2h 45m
2026-05-30 ICE8K KEF → CDG May 30, 08:10 UTCMay 30, 11:15 UTC3h 5m
2026-05-30 ICE630 BOS → KEF May 30, 01:15 UTCMay 30, 06:00 UTC4h 45m
2026-05-29 ICE631 KEF → BOS May 29, 17:25 UTCMay 29, 22:20 UTC4h 55m
2026-05-29 ICE205 CPH → KEF May 29, 12:15 UTCMay 29, 15:00 UTC2h 45m
2026-05-29 ICE204 KEF → CPH May 29, 08:15 UTCMay 29, 10:55 UTC2h 40m
2026-05-28 ICE63L FCO → KEF May 28, 14:35 UTCMay 28, 18:45 UTC4h 10m
2026-05-28 ICE62L KEF → FCO May 28, 08:25 UTCMay 28, 12:25 UTC4h 0m
2026-05-27 ICE451 LHR → KEF May 27, 12:25 UTCMay 27, 15:05 UTC2h 40m
2026-05-27 ICE450 KEF → LHR May 27, 08:00 UTCMay 27, 10:25 UTC2h 25m
2026-05-26 ICE205 CPH → KEF May 26, 12:05 UTCMay 26, 15:14 UTC3h 10m
2026-05-26 ICE204 KEF → CPH May 26, 07:55 UTCMay 26, 10:25 UTC2h 30m
2026-05-26 ICE630 BOS → KEF May 26, 05:10 UTCMay 26, 05:34 UTC25m
2026-05-26 ICE630 BOS → KEF May 26, 01:00 UTCMay 26, 02:10 UTC1h 10m
2026-05-25 ICE631 KEF → BOS May 25, 17:15 UTCMay 25, 22:25 UTC5h 9m
2026-05-25 ICE205 CPH → KEF May 25, 12:10 UTCMay 25, 15:20 UTC3h 10m
2026-05-25 ICE204 KEF → CPH May 25, 08:05 UTCMay 25, 10:35 UTC2h 30m
2026-05-24 ICE63L FCO → KEF May 24, 14:35 UTCMay 24, 18:50 UTC4h 15m
2026-05-24 ICE62L KEF → FCO May 24, 08:00 UTCMay 24, 12:10 UTC4h 10m
2026-05-23 ICE7J CDG → KEF May 23, 12:15 UTCMay 23, 15:25 UTC3h 10m
2026-05-23 ICE8K KEF → CDG May 23, 08:15 UTCMay 23, 11:00 UTC2h 45m
2026-05-22 ICE275 BLL → KEF May 22, 21:30 UTCMay 23, 00:10 UTC2h 40m
2026-05-22 ICE274 KEF → BLL May 22, 16:55 UTCMay 22, 19:25 UTC2h 30m
2026-05-22 ICE205 CPH → KEF May 22, 12:40 UTCMay 22, 15:30 UTC2h 50m
2026-05-22 ICE204 KEF → CPH May 22, 08:40 UTCMay 22, 11:20 UTC2h 39m
2026-05-22 ICE630 BOS → KEF May 22, 01:10 UTCMay 22, 05:40 UTC4h 30m
2026-05-21 ICE631 KEF → BOS May 21, 17:20 UTCMay 21, 22:35 UTC5h 15m
2026-05-21 ICE451 LHR → KEF May 21, 12:10 UTCMay 21, 14:40 UTC2h 30m
2026-05-21 ICE450 KEF → LHR May 21, 07:55 UTCMay 21, 10:30 UTC2h 35m
2026-05-20 ICE451 LHR → KEF May 20, 12:25 UTCMay 20, 15:00 UTC2h 35m
2026-05-20 ICE450 KEF → LHR May 20, 07:50 UTCMay 20, 10:35 UTC2h 45m
2026-05-20 ICE630 BOS → KEF May 20, 01:20 UTCMay 20, 06:00 UTC4h 41m
2026-05-19 ICE631 KEF → BOS May 19, 17:20 UTCMay 19, 22:35 UTC5h 15m
2026-05-19 ICE205 CPH → KEF May 19, 12:10 UTCMay 19, 14:55 UTC2h 45m
2026-05-19 ICE204 KEF → CPH May 19, 07:55 UTCMay 19, 10:45 UTC2h 50m
2026-05-19 ICE630 BOS → KEF May 19, 05:40 UTCMay 19, 06:05 UTC25m
2026-05-19 ICE630 BOS → KEF May 19, 01:20 UTCMay 19, 02:40 UTC1h 20m
2026-05-18 ICE631 KEF → BOS May 18, 17:20 UTCMay 18, 22:15 UTC4h 54m
2026-05-18 ICE205 CPH → KEF May 18, 12:35 UTCMay 18, 15:15 UTC2h 40m
2026-05-18 ICE204 KEF → CPH May 18, 07:50 UTCMay 18, 10:40 UTC2h 50m
2026-05-18 ICE630 BOS → KEF May 18, 01:20 UTCMay 18, 06:01 UTC4h 40m
2026-05-17 ICE631 KEF → BOS May 17, 17:40 UTCMay 17, 22:50 UTC5h 10m
2026-05-17 ICE7J CDG → KEF May 17, 12:10 UTCMay 17, 15:05 UTC2h 55m
2026-05-17 ICE8K KEF → CDG May 17, 07:50 UTCMay 17, 10:45 UTC2h 55m
2026-05-16 ICE7J CDG → KEF May 16, 12:25 UTCMay 16, 15:20 UTC2h 55m
2026-05-16 ICE8K KEF → CDG May 16, 08:01 UTCMay 16, 11:05 UTC3h 5m
2026-05-16 ICE630 BOS → KEF May 16, 01:00 UTCMay 16, 05:46 UTC4h 46m
2026-05-15 ICE631 KEF → BOS May 15, 17:15 UTCMay 15, 22:15 UTC5h 0m
2026-05-15 ICE7J CDG → KEF May 15, 12:30 UTCMay 15, 15:35 UTC3h 4m
2026-05-15 ICE8K KEF → CDG May 15, 08:15 UTCMay 15, 11:05 UTC2h 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 TF-ISO page for operator, model, and routing details .

Mode-S 4CC279 frequently asked

What is Mode-S code 4CC279?
4CC279 is an ICAO 24-bit transponder address. Allocated to Iceland. Assigned to TF-ISO.
Where is Mode-S 4CC279 registered?
Mode-S code 4CC279 is allocated to Iceland (IS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CC279 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CC279, octal 23141171, decimal 5,030,521.
What flights does 4CC279 operate?
Mode-S 4CC279 has broadcast 20 distinct callsigns, including ICE630, ICE631, ICE205, ICE204, ICE8K.