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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
Broadcasting now · callsign ICE204 · 8,050 ft
Flights observed
338
Distinct callsigns
20
Country
IS
Last broadcast
Jul 26, 19:00 UTC

Current position

4CC279 is currently broadcasting. Map zoomed to live position.

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 71 2026-07-25
ICE631 Icelandair 61 2026-07-24
ICE205 Icelandair 41 2026-07-23
ICE204 Icelandair 41 2026-07-23
ICE8K Icelandair 21 2026-07-25
ICE7J Icelandair 20 2026-07-25
ICE451 Icelandair 16 2026-07-24
ICE450 Icelandair 15 2026-07-24
ICE63L Icelandair 10 2026-07-26
ICE62L Icelandair 10 2026-07-26
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
2026-07-26 ICE63L FCO → KEF Jul 26, 14:20 UTCJul 26, 18:55 UTC4h 35m
2026-07-26 ICE62L KEF → FCO Jul 26, 08:00 UTCJul 26, 11:50 UTC3h 50m
2026-07-25 ICE7J CDG → KEF Jul 25, 12:30 UTCJul 25, 15:45 UTC3h 15m
2026-07-25 ICE8K KEF → CDG Jul 25, 08:10 UTCJul 25, 10:45 UTC2h 35m
2026-07-25 ICE630 BOS → KEF Jul 25, 01:05 UTCJul 25, 05:35 UTC4h 30m
2026-07-24 ICE631 KEF → BOS Jul 24, 17:30 UTCJul 24, 22:55 UTC5h 25m
2026-07-24 ICE451 LHR → KEF Jul 24, 12:20 UTCJul 24, 15:00 UTC2h 40m
2026-07-24 ICE450 KEF → LHR Jul 24, 08:00 UTCJul 24, 10:35 UTC2h 35m
2026-07-24 ICE630 BOS → KEF Jul 24, 05:05 UTCJul 24, 05:25 UTC20m
2026-07-24 ICE630 BOS → KEF Jul 24, 01:20 UTCJul 24, 02:45 UTC1h 25m
2026-07-23 ICE631 KEF → BOS Jul 23, 17:25 UTCJul 23, 22:50 UTC5h 25m
2026-07-23 ICE205 CPH → KEF Jul 23, 12:05 UTCJul 23, 15:10 UTC3h 5m
2026-07-23 ICE204 KEF → CPH Jul 23, 08:05 UTCJul 23, 10:35 UTC2h 30m
2026-07-23 ICE630 BOS → KEF Jul 23, 05:15 UTCJul 23, 05:35 UTC20m
2026-07-23 ICE630 BOS → KEF Jul 23, 01:20 UTCJul 23, 02:40 UTC1h 20m
2026-07-22 ICE631 KEF → BOS Jul 22, 17:40 UTCJul 22, 22:55 UTC5h 15m
2026-07-22 ICE451 LHR → KEF Jul 22, 12:25 UTCJul 22, 15:10 UTC2h 45m
2026-07-21 ICE451 - Jul 21, 12:20 UTCJul 21, 15:05 UTC2h 45m
2026-07-21 ICE450 KEF → LHR Jul 21, 08:05 UTCJul 21, 10:40 UTC2h 35m
2026-07-21 ICE630 BOS → KEF Jul 21, 05:20 UTCJul 21, 05:40 UTC20m
2026-07-21 ICE630 BOS → KEF Jul 21, 01:10 UTCJul 21, 02:25 UTC1h 15m
2026-07-20 ICE631 KEF → BOS Jul 20, 17:20 UTCJul 20, 22:25 UTC5h 5m
2026-07-20 ICE451 - Jul 20, 12:30 UTCJul 20, 15:20 UTC2h 50m
2026-07-20 ICE450 KEF → LHR Jul 20, 08:00 UTCJul 20, 10:50 UTC2h 50m
2026-07-19 ICE63L FCO → KEF Jul 19, 14:25 UTCJul 19, 19:05 UTC4h 40m
2026-07-19 ICE62L KEF → FCO Jul 19, 07:55 UTCJul 19, 11:50 UTC3h 55m
2026-07-18 ICE419 - Jul 18, 20:55 UTCJul 18, 23:10 UTC2h 15m
2026-07-18 ICE418 KEF → DUB Jul 18, 17:35 UTCJul 18, 19:25 UTC1h 50m
2026-07-18 ICE7J - Jul 18, 12:50 UTCJul 18, 16:05 UTC3h 15m
2026-07-18 ICE8K KEF → CDG Jul 18, 08:00 UTCJul 18, 10:40 UTC2h 40m
2026-07-18 ICE630 BOS → KEF Jul 18, 01:20 UTCJul 18, 05:55 UTC4h 36m
2026-07-17 ICE631 KEF → BOS Jul 17, 17:20 UTCJul 17, 22:25 UTC5h 5m
2026-07-17 ICE451 LHR → KEF Jul 17, 12:19 UTCJul 17, 15:05 UTC2h 45m
2026-07-17 ICE450 - Jul 17, 07:44 UTCJul 17, 10:15 UTC2h 30m
2026-07-17 ICE630 BOS → KEF Jul 17, 01:15 UTCJul 17, 05:45 UTC4h 30m
2026-07-16 ICE631 KEF → BOS Jul 16, 17:20 UTCJul 16, 22:19 UTC5h 0m
2026-07-16 ICE205 - Jul 16, 12:14 UTCJul 16, 15:05 UTC2h 50m
2026-07-16 ICE204 KEF → CPH Jul 16, 08:10 UTCJul 16, 10:55 UTC2h 45m
2026-07-16 ICE630 BOS → KEF Jul 16, 01:30 UTCJul 16, 06:00 UTC4h 30m
2026-07-15 ICE631 - Jul 15, 17:20 UTCJul 15, 22:30 UTC5h 10m
2026-07-15 ICE451 - Jul 15, 12:40 UTCJul 15, 15:10 UTC2h 30m
2026-07-15 ICE450 - Jul 15, 08:10 UTCJul 15, 11:05 UTC2h 55m
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

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?
Yes. Mode-S 4CC279 is currently airborne.
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.