Apparatus

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sensors Mode-S transponder

51118B

ICAO 24-bit transponder address · allocated to Estonia

Currently assigned to ES-BTC · BOMBARDIER CL-600 Challenger

Hex
51118B
Octal
24210613
Decimal
5,312,907
Country
EE
Tail
ES-BTC
Type
CL60
No current signal · last broadcast 8d ago
Flights observed
93
Distinct callsigns
1
Country
EE
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 51118B.

Country allocation

The ICAO 24-bit address 51118B falls within the block assigned to Estonia (EE) by ICAO Annex 10, Volume III. Every aircraft registered in Estonia 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 1 distinct

Callsign Airline Flights Last seen
VPC004 - 93 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 VPC004 FLR → ATH Jul 26, 10:10 UTCJul 26, 11:50 UTC1h 40m
2026-07-26 VPC004 - Jul 26, 07:05 UTCJul 26, 09:05 UTC2h 0m
2026-07-25 VPC004 - Jul 25, 11:10 UTCJul 25, 13:15 UTC2h 5m
2026-07-25 VPC004 IBZ → CEQ Jul 25, 06:20 UTCJul 25, 07:45 UTC1h 25m
2026-07-23 VPC004 - Jul 23, 14:05 UTCJul 23, 14:30 UTC25m
2026-07-23 VPC004 - Jul 23, 07:25 UTCJul 23, 10:20 UTC2h 55m
2026-07-23 VPC004 - Jul 23, 05:10 UTCJul 23, 06:45 UTC1h 35m
2026-07-22 VPC004 - Jul 22, 11:40 UTCJul 22, 13:25 UTC1h 45m
2026-07-21 VPC004 IBZ → MAD Jul 21, 17:25 UTCJul 21, 18:15 UTC50m
2026-07-20 VPC004 - Jul 20, 11:50 UTCJul 20, 13:00 UTC1h 10m
2026-07-19 VPC004 TLL → CEQ Jul 19, 14:05 UTCJul 19, 17:05 UTC3h 0m
2026-07-19 VPC004 GLA → TLL Jul 19, 10:45 UTCJul 19, 13:10 UTC2h 25m
2026-07-17 VPC004 - Jul 17, 09:40 UTCJul 17, 12:04 UTC2h 25m
2026-07-17 VPC004 - Jul 17, 03:55 UTCJul 17, 07:44 UTC3h 50m
2026-07-16 VPC004 - Jul 16, 14:15 UTCJul 16, 16:30 UTC2h 15m
2026-07-16 VPC004 OLB → FLR Jul 16, 11:10 UTCJul 16, 11:50 UTC40m
2026-07-16 VPC004 - Jul 16, 08:45 UTCJul 16, 10:10 UTC1h 25m
2026-07-13 VPC004 - Jul 13, 12:30 UTCJul 13, 13:50 UTC1h 20m
2026-07-13 VPC004 ZRH → FAB Jul 13, 08:45 UTCJul 13, 10:05 UTC1h 20m
2026-07-11 VPC004 - Jul 11, 11:05 UTCJul 11, 12:30 UTC1h 25m
2026-07-10 VPC004 - Jul 10, 15:20 UTCJul 10, 19:10 UTC3h 50m
2026-07-10 VPC004 - Jul 10, 10:25 UTCJul 10, 13:20 UTC2h 55m
2026-07-08 VPC004 - Jul 8, 19:30 UTCJul 8, 21:40 UTC2h 10m
2026-07-08 VPC004 - Jul 8, 13:05 UTCJul 8, 14:50 UTC1h 45m
2026-07-08 VPC004 - Jul 8, 09:30 UTCJul 8, 11:40 UTC2h 10m
2026-07-07 VPC004 - Jul 7, 12:00 UTCJul 7, 13:05 UTC1h 5m
2026-07-07 VPC004 - Jul 7, 07:40 UTCJul 7, 10:50 UTC3h 10m
2026-07-06 VPC004 - Jul 6, 12:20 UTCJul 6, 14:25 UTC2h 5m
2026-07-06 VPC004 - Jul 6, 07:05 UTCJul 6, 10:10 UTC3h 5m
2026-07-04 VPC004 TLL → VIE Jul 4, 09:55 UTCJul 4, 11:50 UTC1h 55m
2026-07-03 VPC004 - Jul 3, 16:55 UTCJul 3, 17:25 UTC30m
2026-07-02 VPC004 - Jul 2, 11:40 UTCJul 2, 12:10 UTC30m
2026-07-02 VPC004 - Jul 2, 09:05 UTCJul 2, 10:35 UTC1h 30m
2026-07-02 VPC004 - Jul 2, 06:15 UTCJul 2, 08:05 UTC1h 50m
2026-07-01 VPC004 - Jul 1, 15:50 UTCJul 1, 16:25 UTC35m
2026-07-01 VPC004 GVA → RIX Jul 1, 12:40 UTCJul 1, 14:55 UTC2h 15m
2026-07-01 VPC004 - Jul 1, 10:25 UTCJul 1, 11:10 UTC45m
2026-06-29 VPC004 - Jun 29, 09:54 UTCJun 29, 14:39 UTC4h 45m
2026-06-27 VPC004 - Jun 27, 15:10 UTCJun 27, 17:29 UTC2h 20m
2026-06-27 VPC004 - Jun 27, 11:04 UTCJun 27, 14:25 UTC3h 20m
2026-06-26 VPC004 - Jun 26, 15:34 UTCJun 26, 17:54 UTC2h 20m
2026-06-26 VPC004 - Jun 26, 10:25 UTCJun 26, 13:55 UTC3h 30m
2026-06-26 VPC004 - Jun 26, 07:50 UTCJun 26, 09:30 UTC1h 40m
2026-06-25 VPC004 - Jun 25, 06:50 UTCJun 25, 08:14 UTC1h 25m
2026-06-23 VPC004 - Jun 23, 15:34 UTCJun 23, 16:29 UTC55m
2026-06-23 VPC004 - Jun 23, 10:39 UTCJun 23, 13:55 UTC3h 15m
2026-06-23 VPC004 - Jun 23, 06:04 UTCJun 23, 09:05 UTC3h 0m
2026-06-22 VPC004 BRN → TLL Jun 22, 10:00 UTCJun 22, 12:19 UTC2h 20m
2026-06-22 VPC004 TLL → BRN Jun 22, 03:50 UTCJun 22, 06:19 UTC2h 30m
2026-06-21 VPC004 - Jun 21, 12:04 UTCJun 21, 14:19 UTC2h 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 ES-BTC page for operator, model, and routing details .

Mode-S 51118B frequently asked

What is Mode-S code 51118B?
51118B is an ICAO 24-bit transponder address. Allocated to Estonia. Assigned to ES-BTC.
Where is Mode-S 51118B registered?
Mode-S code 51118B is allocated to Estonia (EE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 51118B broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 51118B, octal 24210613, decimal 5,312,907.
What flights does 51118B operate?
Mode-S 51118B has broadcast 1 distinct callsign, including VPC004.