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sensors Mode-S transponder

4AC9C4

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RND · BOEING 737 MAX 8

Hex
4AC9C4
Octal
22544704
Decimal
4,901,316
Country
SE
Tail
SE-RND
Type
B38M
Broadcasting now · callsign BLX573 · 37,000 ft
Flights observed
281
Distinct callsigns
20
Country
SE
Last broadcast
1h ago

Current position

4AC9C4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4AC9C4 falls within the block assigned to Sweden (SE) by ICAO Annex 10, Volume III. Every aircraft registered in Sweden 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
BLX261 TUIfly Nordic 6 2026-06-22
BLX7AH - 5 2026-07-11
BLX254 - 5 2026-07-11
BLX175 - 5 2026-07-12
BLX157 - 5 2026-07-07
BLX156 - 5 2026-07-11
BLX155 - 5 2026-07-11
BLX8HC - 4 2026-07-03
BLX563 - 4 2026-07-05
BLX536 - 4 2026-06-21
BLX535 TUIfly Nordic 4 2026-06-21
BLX502 - 4 2026-06-18
BLX501 - 4 2026-06-18
BLX495 - 4 2026-06-24
BLX466 - 4 2026-06-23
BLX465 TUIfly Nordic 4 2026-06-23
BLX464 - 4 2026-07-09
BLX463 - 4 2026-07-09
BLX3BH - 4 2026-07-03
BLX386 TUIfly Nordic 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BLX573 - Jul 14, 04:50 UTCJul 14, 05:00 UTC10m
2026-07-13 BLX162 - Jul 13, 20:00 UTCJul 13, 22:45 UTC2h 45m
2026-07-13 BLX161 - Jul 13, 16:00 UTCJul 13, 18:55 UTC2h 55m
2026-07-13 BLX282 - Jul 13, 11:10 UTCJul 13, 14:25 UTC3h 15m
2026-07-13 BLX6BK - Jul 13, 06:01 UTCJul 13, 09:05 UTC3h 5m
2026-07-12 BLX176 AHO → ARN Jul 12, 20:05 UTCJul 12, 23:00 UTC2h 55m
2026-07-12 BLX175 ARN → AHO Jul 12, 15:40 UTCJul 12, 18:40 UTC3h 0m
2026-07-12 BLX612 - Jul 12, 10:45 UTCJul 12, 14:15 UTC3h 30m
2026-07-12 BLX611 - Jul 12, 05:45 UTCJul 12, 09:15 UTC3h 30m
2026-07-11 BLX254 - Jul 11, 20:40 UTCJul 12, 00:20 UTC3h 40m
2026-07-11 BLX7AH ARN → AYT Jul 11, 15:35 UTCJul 11, 19:10 UTC3h 35m
2026-07-11 BLX156 - Jul 11, 10:25 UTCJul 11, 13:50 UTC3h 25m
2026-07-11 BLX155 - Jul 11, 05:01 UTCJul 11, 08:15 UTC3h 15m
2026-07-10 BLX538 RHO → ARN Jul 10, 21:20 UTCJul 11, 01:05 UTC3h 45m
2026-07-10 BLX537 ARN → RHO Jul 10, 16:20 UTCJul 10, 19:45 UTC3h 25m
2026-07-10 BLX328 - Jul 10, 10:50 UTCJul 10, 14:25 UTC3h 35m
2026-07-10 BLX327 ARN → KGS Jul 10, 06:05 UTCJul 10, 09:25 UTC3h 20m
2026-07-09 BLX8BV - Jul 9, 20:45 UTCJul 10, 00:30 UTC3h 45m
2026-07-09 BLX435 - Jul 9, 16:00 UTCJul 9, 19:10 UTC3h 10m
2026-07-09 BLX464 RHO → ARN Jul 9, 10:15 UTCJul 9, 14:10 UTC3h 55m
2026-07-09 BLX463 ARN → RHO Jul 9, 05:05 UTCJul 9, 08:20 UTC3h 15m
2026-07-08 BLX374 - Jul 8, 19:35 UTCJul 8, 23:10 UTC3h 35m
2026-07-08 BLX373 ARN → KGS Jul 8, 15:00 UTCJul 8, 18:20 UTC3h 20m
2026-07-08 BLX378 - Jul 8, 09:10 UTCJul 8, 12:40 UTC3h 30m
2026-07-08 BLX377 - Jul 8, 04:25 UTCJul 8, 07:30 UTC3h 5m
2026-07-07 BLX134 - Jul 7, 20:35 UTCJul 8, 00:15 UTC3h 40m
2026-07-07 BLX133 - Jul 7, 15:40 UTCJul 7, 19:05 UTC3h 25m
2026-07-07 BLX158 - Jul 7, 10:20 UTCJul 7, 13:55 UTC3h 35m
2026-07-07 BLX157 - Jul 7, 05:15 UTCJul 7, 08:25 UTC3h 10m
2026-07-06 BLX162 - Jul 6, 19:50 UTCJul 6, 22:50 UTC3h 0m
2026-07-06 BLX161 ARN → BOJ Jul 6, 15:55 UTCJul 6, 18:35 UTC2h 40m
2026-07-06 BLX634 - Jul 6, 10:05 UTCJul 6, 14:30 UTC4h 25m
2026-07-06 BLX633 - Jul 6, 04:35 UTCJul 6, 08:30 UTC3h 55m
2026-07-05 BLX722 - Jul 5, 21:20 UTCJul 6, 00:50 UTC3h 30m
2026-07-05 BLX721 - Jul 5, 16:20 UTCJul 5, 19:35 UTC3h 15m
2026-07-05 BLX564 - Jul 5, 10:20 UTCJul 5, 13:55 UTC3h 35m
2026-07-05 BLX563 - Jul 5, 05:35 UTCJul 5, 08:40 UTC3h 5m
2026-07-04 BLX254 AYT → ARN Jul 4, 20:50 UTCJul 5, 00:40 UTC3h 50m
2026-07-04 BLX7AH ARN → AYT Jul 4, 15:30 UTCJul 4, 19:10 UTC3h 40m
2026-07-04 BLX156 - Jul 4, 10:20 UTCJul 4, 13:35 UTC3h 15m
2026-07-04 BLX155 - Jul 4, 05:05 UTCJul 4, 08:20 UTC3h 15m
2026-07-03 BLX8HC - Jul 3, 18:35 UTCJul 3, 22:50 UTC4h 15m
2026-07-03 BLX3BH ARN → LCA Jul 3, 13:15 UTCJul 3, 17:20 UTC4h 5m
2026-07-03 BLX8HY - Jul 3, 09:05 UTCJul 3, 11:15 UTC2h 10m
2026-07-03 BLX173 - Jul 3, 05:00 UTCJul 3, 07:20 UTC2h 20m
2026-07-02 BLX8BV - Jul 2, 20:40 UTCJul 3, 00:10 UTC3h 30m
2026-07-02 BLX435 - Jul 2, 16:00 UTCJul 2, 19:35 UTC3h 35m
2026-07-02 BLX464 RHO → ARN Jul 2, 10:35 UTCJul 2, 14:15 UTC3h 40m
2026-07-02 BLX463 ARN → RHO Jul 2, 05:35 UTCJul 2, 09:05 UTC3h 30m
2026-07-01 BLX374 KGS → ARN Jul 1, 20:00 UTCJul 1, 23:15 UTC3h 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 SE-RND page for operator, model, and routing details .

Mode-S 4AC9C4 frequently asked

What is Mode-S code 4AC9C4?
4AC9C4 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RND.
Where is Mode-S 4AC9C4 registered?
Mode-S code 4AC9C4 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9C4 broadcasting right now?
Yes. Mode-S 4AC9C4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AC9C4, octal 22544704, decimal 4,901,316.
What flights does 4AC9C4 operate?
Mode-S 4AC9C4 has broadcast 20 distinct callsigns, including BLX261, BLX7AH, BLX254, BLX175, BLX157.