Apparatus

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sensors Mode-S transponder

51113C

ICAO 24-bit transponder address · allocated to Estonia

Currently assigned to ES-NTA · ATR-42-500

Hex
51113C
Octal
24210474
Decimal
5,312,828
Country
EE
Tail
ES-NTA
Type
AT45
No current signal · last broadcast 8h ago
Flights observed
154
Distinct callsigns
13
Country
EE
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 51113C.

Country allocation

The ICAO 24-bit address 51113C 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 13 distinct

Callsign Airline Flights Last seen
NYX208 NyxAir 38 2026-05-29
NYX207 NyxAir 35 2026-05-29
NYX202 NyxAir 34 2026-05-25
NYX201 NyxAir 34 2026-05-25
NYX225 NyxAir 3 2026-05-11
NYX900 NyxAir 2 2026-05-29
NYX226 NyxAir 2 2026-05-10
NYX701 - 1 2026-04-30
NYX700 - 1 2026-04-30
NYX224 NyxAir 1 2026-05-09
NYX223 NyxAir 1 2026-05-09
NIKI202 - 1 2026-05-01
MIKI201 - 1 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 NYX208 URE → TLL May 29, 16:40 UTCMay 29, 17:10 UTC30m
2026-05-29 NYX207 TLL → URE May 29, 15:30 UTCMay 29, 15:55 UTC25m
2026-05-29 NYX900 OST → TLL May 29, 13:25 UTCMay 29, 13:45 UTC20m
2026-05-25 NYX900 OST → TLL May 25, 06:45 UTCMay 25, 07:00 UTC15m
2026-05-25 NYX202 URE → TLL May 25, 05:50 UTCMay 25, 06:15 UTC25m
2026-05-25 NYX201 TLL → URE May 25, 04:50 UTCMay 25, 05:10 UTC20m
2026-05-24 NYX208 URE → TLL May 24, 16:45 UTCMay 24, 17:10 UTC25m
2026-05-24 NYX207 TLL → URE May 24, 15:30 UTCMay 24, 15:55 UTC25m
2026-05-23 NYX202 URE → TLL May 23, 08:20 UTCMay 23, 08:50 UTC30m
2026-05-23 NYX201 TLL → URE May 23, 07:20 UTCMay 23, 07:45 UTC25m
2026-05-22 NYX208 URE → TLL May 22, 16:35 UTCMay 22, 17:00 UTC25m
2026-05-22 NYX207 TLL → URE May 22, 15:35 UTCMay 22, 16:00 UTC25m
2026-05-22 NYX202 URE → TLL May 22, 05:50 UTCMay 22, 06:15 UTC25m
2026-05-22 NYX201 TLL → URE May 22, 04:40 UTCMay 22, 05:05 UTC25m
2026-05-21 NYX208 URE → TLL May 21, 16:55 UTCMay 21, 17:25 UTC30m
2026-05-21 NYX207 TLL → URE May 21, 15:30 UTCMay 21, 16:01 UTC30m
2026-05-21 NYX202 URE → TLL May 21, 05:50 UTCMay 21, 06:15 UTC25m
2026-05-21 NYX201 TLL → URE May 21, 04:40 UTCMay 21, 05:05 UTC25m
2026-05-20 NYX208 URE → TLL May 20, 16:35 UTCMay 20, 17:00 UTC25m
2026-05-20 NYX207 TLL → URE May 20, 15:30 UTCMay 20, 15:50 UTC20m
2026-05-20 NYX202 URE → TLL May 20, 05:50 UTCMay 20, 06:15 UTC25m
2026-05-20 NYX201 TLL → URE May 20, 04:40 UTCMay 20, 05:00 UTC20m
2026-05-19 NYX208 URE → TLL May 19, 16:40 UTCMay 19, 17:05 UTC25m
2026-05-19 NYX207 TLL → URE May 19, 15:40 UTCMay 19, 16:05 UTC25m
2026-05-19 NYX202 URE → TLL May 19, 05:50 UTCMay 19, 06:15 UTC25m
2026-05-19 NYX201 TLL → URE May 19, 04:45 UTCMay 19, 05:10 UTC25m
2026-05-18 NYX208 URE → TLL May 18, 16:35 UTCMay 18, 17:05 UTC30m
2026-05-18 NYX207 TLL → URE May 18, 15:35 UTCMay 18, 15:55 UTC20m
2026-05-18 NYX202 URE → TLL May 18, 05:50 UTCMay 18, 06:10 UTC20m
2026-05-18 NYX201 TLL → URE May 18, 04:40 UTCMay 18, 05:00 UTC20m
2026-05-17 NYX208 URE → TLL May 17, 16:40 UTCMay 17, 17:01 UTC20m
2026-05-17 NYX207 TLL → URE May 17, 15:31 UTCMay 17, 15:55 UTC25m
2026-05-16 NYX202 URE → TLL May 16, 08:11 UTCMay 16, 08:36 UTC25m
2026-05-16 NYX201 TLL → URE May 16, 07:01 UTCMay 16, 07:20 UTC20m
2026-05-15 NYX208 URE → TLL May 15, 16:45 UTCMay 15, 17:05 UTC20m
2026-05-15 NYX207 TLL → URE May 15, 15:30 UTCMay 15, 15:50 UTC20m
2026-05-15 NYX202 URE → TLL May 15, 05:45 UTCMay 15, 06:10 UTC25m
2026-05-15 NYX201 TLL → URE May 15, 04:40 UTCMay 15, 05:05 UTC25m
2026-05-14 NYX208 URE → TLL May 14, 16:35 UTCMay 14, 17:00 UTC25m
2026-05-14 NYX207 TLL → URE May 14, 15:35 UTCMay 14, 16:00 UTC25m
2026-05-14 NYX202 URE → TLL May 14, 05:50 UTCMay 14, 06:20 UTC30m
2026-05-14 NYX201 TLL → URE May 14, 04:40 UTCMay 14, 05:05 UTC25m
2026-05-13 NYX208 URE → TLL May 13, 16:35 UTCMay 13, 17:00 UTC25m
2026-05-13 NYX207 TLL → URE May 13, 15:25 UTCMay 13, 15:45 UTC20m
2026-05-13 NYX202 URE → TLL May 13, 05:50 UTCMay 13, 06:10 UTC20m
2026-05-13 NYX201 TLL → URE May 13, 04:35 UTCMay 13, 05:00 UTC25m
2026-05-12 NYX208 URE → TLL May 12, 16:35 UTCMay 12, 17:00 UTC25m
2026-05-12 NYX207 TLL → URE May 12, 15:30 UTCMay 12, 15:55 UTC25m
2026-05-12 NYX202 URE → TLL May 12, 05:55 UTCMay 12, 06:15 UTC20m
2026-05-12 NYX201 TLL → URE May 12, 04:35 UTCMay 12, 05:00 UTC25m

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-NTA page for operator, model, and routing details .

Mode-S 51113C frequently asked

What is Mode-S code 51113C?
51113C is an ICAO 24-bit transponder address. Allocated to Estonia. Assigned to ES-NTA.
Where is Mode-S 51113C registered?
Mode-S code 51113C is allocated to Estonia (EE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 51113C broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 51113C, octal 24210474, decimal 5,312,828.
What flights does 51113C operate?
Mode-S 51113C has broadcast 13 distinct callsigns, including NYX208, NYX207, NYX202, NYX201, NYX225.