Apparatus

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sensors Mode-S transponder

801851

ICAO 24-bit transponder address · allocated to India

Currently assigned to VT-NMH · AIRBUS A-321neo

Hex
801851
Octal
40014121
Decimal
8,394,833
Country
IN
Tail
VT-NMH
Type
A21N
Transponder active on ground
Flights observed
565
Distinct callsigns
20
Country
IN
Last broadcast
22m ago

Last known position

Most recent position reported by Mode-S 801851.

Country allocation

The ICAO 24-bit address 801851 falls within the block assigned to India (IN) by ICAO Annex 10, Volume III. Every aircraft registered in India 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
IGO255K - 10 2026-06-12
IGO451M IndiGo Airlines 8 2026-05-13
IGO5294 - 7 2026-06-23
IGO38FL - 7 2026-05-13
IGO6349 IndiGo Airlines 6 2026-06-12
IGO611H IndiGo Airlines 6 2026-06-12
IGO5388 - 6 2026-06-23
IGO5329 - 6 2026-06-23
IGO392M - 6 2026-05-13
IGO142F - 6 2026-06-23
IGO1014 - 6 2026-07-09
IGO1013 - 6 2026-07-09
IGO817L - 5 2026-06-16
IGO646V - 5 2026-06-27
IGO5293 - 5 2026-06-23
IGO5205 - 5 2026-06-24
IGO405K - 5 2026-06-25
IGO324P IndiGo Airlines 5 2026-05-13
IGO322 IndiGo Airlines 5 2026-06-03
IGO321F - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 IGO248F - Jul 14, 12:35 UTCJul 14, 14:15 UTC1h 40m
2026-07-14 IGO2275 CCU → DEL Jul 14, 08:40 UTCJul 14, 10:25 UTC1h 45m
2026-07-14 IGO497W DEL → CCU Jul 14, 05:15 UTCJul 14, 07:10 UTC1h 55m
2026-07-14 IGO471J CCU → DEL Jul 14, 01:45 UTCJul 14, 03:35 UTC1h 50m
2026-07-13 IGO374F - Jul 13, 18:15 UTCJul 13, 20:05 UTC1h 50m
2026-07-13 IGO770 - Jul 13, 14:25 UTCJul 13, 16:55 UTC2h 30m
2026-07-13 IGO2379 - Jul 13, 10:40 UTCJul 13, 13:05 UTC2h 25m
2026-07-13 IGO1074 - Jul 13, 07:55 UTCJul 13, 08:15 UTC20m
2026-07-12 IGO1074 - Jul 12, 22:35 UTCJul 13, 07:01 UTC8h 25m
2026-07-12 IGO19K - Jul 12, 13:50 UTCJul 12, 16:55 UTC3h 5m
2026-07-12 IGO47H - Jul 12, 11:50 UTCJul 12, 12:15 UTC25m
2026-07-12 IGO47H - Jul 12, 09:50 UTCJul 12, 10:15 UTC25m
2026-07-12 IGO1340 - Jul 12, 07:35 UTCJul 12, 07:50 UTC15m
2026-07-12 IGO1340 - Jul 12, 03:10 UTCJul 12, 06:45 UTC3h 35m
2026-07-12 IGO1339 - Jul 12, 00:20 UTCJul 12, 01:10 UTC50m
2026-07-11 IGO1339 - Jul 11, 20:05 UTCJul 11, 20:15 UTC10m
2026-07-11 IGO1164 - Jul 11, 16:30 UTCJul 11, 16:50 UTC20m
2026-07-11 IGO1164 - Jul 11, 12:05 UTCJul 11, 12:55 UTC50m
2026-07-11 IGO1163 - Jul 11, 08:01 UTCJul 11, 09:05 UTC1h 5m
2026-07-11 IGO1163 - Jul 11, 03:40 UTCJul 11, 03:50 UTC10m
2026-07-11 IGO6196 - Jul 11, 01:55 UTCJul 11, 02:05 UTC10m
2026-07-10 IGO919M - Jul 10, 17:45 UTCJul 10, 18:05 UTC20m
2026-07-10 IGO321F - Jul 10, 16:10 UTCJul 10, 16:30 UTC20m
2026-07-10 IGO321F - Jul 10, 14:50 UTCJul 10, 15:20 UTC30m
2026-07-10 IGO343H - Jul 10, 11:30 UTCJul 10, 13:15 UTC1h 45m
2026-07-10 IGO1072 - Jul 10, 09:10 UTCJul 10, 09:25 UTC15m
2026-07-10 IGO1073 - Jul 10, 00:10 UTCJul 10, 02:05 UTC1h 55m
2026-07-09 IGO1014 - Jul 9, 12:05 UTCJul 9, 17:15 UTC5h 10m
2026-07-09 IGO1013 - Jul 9, 04:00 UTCJul 9, 09:35 UTC5h 35m
2026-07-08 IGO1014 - Jul 8, 12:00 UTCJul 8, 17:35 UTC5h 35m
2026-07-08 IGO1013 - Jul 8, 04:00 UTCJul 8, 09:30 UTC5h 30m
2026-07-07 IGO1014 SIN → DEL Jul 7, 12:10 UTCJul 7, 17:20 UTC5h 10m
2026-07-07 IGO1013 - Jul 7, 03:50 UTCJul 7, 09:35 UTC5h 45m
2026-07-06 IGO1014 SIN → DEL Jul 6, 11:55 UTCJul 6, 16:45 UTC4h 50m
2026-07-06 IGO1013 - Jul 6, 04:15 UTCJul 6, 09:55 UTC5h 40m
2026-07-05 IGO2369 - Jul 5, 19:55 UTCJul 6, 00:10 UTC4h 15m
2026-07-05 IGO901M - Jul 5, 19:00 UTCJul 5, 19:10 UTC10m
2026-07-05 IGO5149 MAA → BOM Jul 5, 17:05 UTCJul 5, 17:25 UTC20m
2026-07-05 IGO947 - Jul 5, 11:40 UTCJul 5, 15:40 UTC4h 0m
2026-07-05 IGO939 DEL → DEL Jul 5, 04:00 UTCJul 5, 10:05 UTC6h 5m
2026-07-04 IGO74AR - Jul 4, 23:40 UTCJul 5, 02:00 UTC2h 20m
2026-07-04 IGO624P - Jul 4, 19:30 UTCJul 4, 20:45 UTC1h 15m
2026-07-04 IGO19K - Jul 4, 14:00 UTCJul 4, 16:55 UTC2h 55m
2026-07-04 IGO47H - Jul 4, 12:20 UTCJul 4, 12:45 UTC25m
2026-07-04 IGO47H - Jul 4, 10:10 UTCJul 4, 10:50 UTC40m
2026-07-04 IGO1340 - Jul 4, 07:50 UTCJul 4, 08:05 UTC15m
2026-07-04 IGO1340 - Jul 4, 03:05 UTCJul 4, 03:50 UTC45m
2026-07-03 IGO1339 - Jul 3, 21:00 UTCJul 4, 01:05 UTC4h 5m
2026-07-03 IGO1604 - Jul 3, 10:55 UTCJul 3, 11:10 UTC15m
2026-07-03 IGO1604 - Jul 3, 07:15 UTCJul 3, 09:50 UTC2h 35m

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 VT-NMH page for operator, model, and routing details .

Mode-S 801851 frequently asked

What is Mode-S code 801851?
801851 is an ICAO 24-bit transponder address. Allocated to India. Assigned to VT-NMH.
Where is Mode-S 801851 registered?
Mode-S code 801851 is allocated to India (IN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 801851 broadcasting right now?
Mode-S 801851 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 801851, octal 40014121, decimal 8,394,833.
What flights does 801851 operate?
Mode-S 801851 has broadcast 20 distinct callsigns, including IGO255K, IGO451M, IGO5294, IGO38FL, IGO6349.