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 1d ago
Flights observed
296
Distinct callsigns
20
Country
IS
Last broadcast
1d 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 - 61 2026-07-12
ICE631 - 54 2026-07-11
ICE205 - 39 2026-07-13
ICE204 - 39 2026-07-13
ICE8K - 19 2026-07-05
ICE7J - 18 2026-07-05
ICE451 - 10 2026-07-09
ICE450 - 10 2026-07-09
ICE63L - 8 2026-07-02
ICE62L - 8 2026-07-02
ICE501 Icelandair 3 2026-05-02
ICE500 Icelandair 3 2026-05-02
ICE455 - 3 2026-07-13
ICE454 - 3 2026-07-13
ICE319 Icelandair 2 2026-04-16
ICE318 Icelandair 2 2026-04-16
ICE307 Icelandair 2 2026-06-05
ICE306 Icelandair 2 2026-06-05
ICE83C Icelandair 1 2026-06-10
ICE82B Icelandair 1 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ICE455 - Jul 13, 21:00 UTCJul 13, 23:35 UTC2h 35m
2026-07-13 ICE454 KEF → LHR Jul 13, 16:25 UTCJul 13, 19:05 UTC2h 40m
2026-07-13 ICE205 CPH → KEF Jul 13, 12:15 UTCJul 13, 15:00 UTC2h 45m
2026-07-13 ICE204 KEF → CPH Jul 13, 08:10 UTCJul 13, 11:00 UTC2h 50m
2026-07-12 ICE205 CPH → KEF Jul 12, 12:40 UTCJul 12, 15:40 UTC3h 0m
2026-07-12 ICE204 KEF → CPH Jul 12, 08:01 UTCJul 12, 10:40 UTC2h 40m
2026-07-12 ICE630 BOS → KEF Jul 12, 01:05 UTCJul 12, 05:35 UTC4h 30m
2026-07-11 ICE631 - Jul 11, 17:10 UTCJul 11, 22:25 UTC5h 15m
2026-07-11 ICE205 - Jul 11, 12:10 UTCJul 11, 15:10 UTC3h 0m
2026-07-11 ICE204 KEF → CPH Jul 11, 07:55 UTCJul 11, 10:35 UTC2h 40m
2026-07-10 ICE205 CPH → KEF Jul 10, 12:10 UTCJul 10, 15:05 UTC2h 55m
2026-07-10 ICE204 KEF → CPH Jul 10, 08:00 UTCJul 10, 10:40 UTC2h 40m
2026-07-10 ICE630 BOS → KEF Jul 10, 01:15 UTCJul 10, 05:50 UTC4h 35m
2026-07-09 ICE631 - Jul 9, 21:05 UTCJul 9, 22:30 UTC1h 25m
2026-07-09 ICE631 - Jul 9, 17:15 UTCJul 9, 17:30 UTC15m
2026-07-09 ICE451 - Jul 9, 12:30 UTCJul 9, 14:55 UTC2h 25m
2026-07-09 ICE450 KEF → LHR Jul 9, 08:00 UTCJul 9, 10:40 UTC2h 40m
2026-07-08 ICE451 - Jul 8, 12:15 UTCJul 8, 14:45 UTC2h 30m
2026-07-08 ICE450 KEF → LHR Jul 8, 08:15 UTCJul 8, 10:45 UTC2h 30m
2026-07-08 ICE630 BOS → KEF Jul 8, 01:10 UTCJul 8, 06:00 UTC4h 50m
2026-07-07 ICE631 KEF → BOS Jul 7, 17:20 UTCJul 7, 22:30 UTC5h 10m
2026-07-07 ICE205 CPH → KEF Jul 7, 12:25 UTCJul 7, 15:30 UTC3h 5m
2026-07-07 ICE204 KEF → CPH Jul 7, 07:55 UTCJul 7, 10:25 UTC2h 30m
2026-07-07 ICE630 BOS → KEF Jul 7, 01:00 UTCJul 7, 05:40 UTC4h 40m
2026-07-06 ICE631 KEF → BOS Jul 6, 17:30 UTCJul 6, 22:25 UTC4h 55m
2026-07-06 ICE205 CPH → KEF Jul 6, 12:40 UTCJul 6, 15:45 UTC3h 5m
2026-07-06 ICE204 KEF → CPH Jul 6, 08:30 UTCJul 6, 11:00 UTC2h 30m
2026-07-06 ICE630 BOS → KEF Jul 6, 02:40 UTCJul 6, 07:15 UTC4h 35m
2026-07-05 ICE631 KEF → BOS Jul 5, 17:20 UTCJul 5, 22:30 UTC5h 10m
2026-07-05 ICE7J - Jul 5, 12:30 UTCJul 5, 15:40 UTC3h 10m
2026-07-05 ICE8K KEF → CDG Jul 5, 08:00 UTCJul 5, 10:40 UTC2h 40m
2026-07-05 ICE630 BOS → KEF Jul 5, 01:00 UTCJul 5, 05:30 UTC4h 30m
2026-07-04 ICE631 - Jul 4, 21:05 UTCJul 4, 22:40 UTC1h 35m
2026-07-04 ICE631 - Jul 4, 17:20 UTCJul 4, 17:30 UTC10m
2026-07-04 ICE205 CPH → KEF Jul 4, 12:20 UTCJul 4, 15:25 UTC3h 5m
2026-07-04 ICE204 KEF → CPH Jul 4, 08:05 UTCJul 4, 10:35 UTC2h 30m
2026-07-03 ICE205 CPH → KEF Jul 3, 12:20 UTCJul 3, 15:15 UTC2h 55m
2026-07-03 ICE204 KEF → CPH Jul 3, 08:10 UTCJul 3, 10:50 UTC2h 40m
2026-07-02 ICE63L FCO → KEF Jul 2, 14:50 UTCJul 2, 19:10 UTC4h 20m
2026-07-02 ICE62L KEF → FCO Jul 2, 08:15 UTCJul 2, 12:15 UTC4h 0m
2026-07-01 ICE205 CPH → KEF Jul 1, 12:10 UTCJul 1, 15:05 UTC2h 55m
2026-07-01 ICE204 KEF → CPH Jul 1, 07:55 UTCJul 1, 10:35 UTC2h 40m
2026-07-01 ICE630 BOS → KEF Jul 1, 01:10 UTCJul 1, 06:00 UTC4h 50m
2026-06-30 ICE631 - Jun 30, 17:25 UTCJun 30, 22:15 UTC4h 50m
2026-06-30 ICE205 CPH → KEF Jun 30, 12:25 UTCJun 30, 15:15 UTC2h 50m
2026-06-30 ICE204 KEF → CPH Jun 30, 08:00 UTCJun 30, 10:45 UTC2h 45m
2026-06-29 ICE205 CPH → KEF Jun 29, 12:09 UTCJun 29, 14:54 UTC2h 45m
2026-06-29 ICE204 KEF → CPH Jun 29, 07:55 UTCJun 29, 10:34 UTC2h 40m
2026-06-29 ICE630 BOS → KEF Jun 29, 01:05 UTCJun 29, 05:45 UTC4h 40m
2026-06-28 ICE631 KEF → BOS Jun 28, 17:34 UTCJun 28, 22:49 UTC5h 15m

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 1d 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.