Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4891B8

ICAO 24-bit transponder address · allocated to Poland

Currently assigned to SP-ENV · BOEING 737-800

Hex
4891B8
Octal
22110670
Decimal
4,755,896
Country
PL
Tail
SP-ENV
Type
B738
No current signal · last broadcast 8h ago
Flights observed
207
Distinct callsigns
20
Country
PL
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 4891B8.

Country allocation

The ICAO 24-bit address 4891B8 falls within the block assigned to Poland (PL) by ICAO Annex 10, Volume III. Every aircraft registered in Poland 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
ENT7598 DAT Enterprise Limited 3 2026-04-14
ENT501N - 3 2026-05-20
ENT8UY - 2 2026-07-12
ENT7344 - 2 2026-06-06
ENT6RB - 2 2026-05-31
ENT6052 - 2 2026-07-13
ENT6051 - 2 2026-07-13
ENT5MU - 2 2026-04-15
ENT532 - 2 2026-06-27
ENT516P DAT Enterprise Limited 2 2026-05-16
ENT4866 - 2 2026-06-23
ENT4185 - 2 2026-06-21
ENT3CU DAT Enterprise Limited 2 2026-04-15
ENT9ZP - 1 2026-06-26
ENT9ZB - 1 2026-06-26
ENT9YC - 1 2026-07-11
ENT9XF - 1 2026-05-22
ENT9TA - 1 2026-05-23
ENT9PJ - 1 2026-05-25
ENT9HP - 1 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ENT6052 - Jul 13, 17:10 UTCJul 13, 18:55 UTC1h 45m
2026-07-13 ENT6051 - Jul 13, 14:30 UTCJul 13, 16:00 UTC1h 30m
2026-07-13 ENT8KW - Jul 13, 04:30 UTCJul 13, 13:10 UTC8h 40m
2026-07-12 ENT8UY - Jul 12, 18:40 UTCJul 12, 21:20 UTC2h 40m
2026-07-12 ENT6KS - Jul 12, 14:35 UTCJul 12, 17:01 UTC2h 25m
2026-07-12 ENT3MX - Jul 12, 04:25 UTCJul 12, 13:10 UTC8h 45m
2026-07-11 ENT7WA - Jul 11, 13:05 UTCJul 11, 21:50 UTC8h 45m
2026-07-11 ENT9YC RHO → BSL Jul 11, 08:45 UTCJul 11, 11:50 UTC3h 5m
2026-07-11 ENT5HJ - Jul 11, 04:20 UTCJul 11, 07:00 UTC2h 40m
2026-07-10 ENT6052 - Jul 10, 18:05 UTCJul 10, 19:50 UTC1h 45m
2026-07-10 ENT6051 - Jul 10, 15:30 UTCJul 10, 17:00 UTC1h 30m
2026-07-10 ENT6SZ - Jul 10, 11:15 UTCJul 10, 14:20 UTC3h 5m
2026-07-10 ENT4EY - Jul 10, 07:20 UTCJul 10, 10:00 UTC2h 40m
2026-07-09 ENT3XS - Jul 9, 10:45 UTCJul 9, 13:45 UTC3h 0m
2026-07-09 ENT8PB - Jul 9, 07:00 UTCJul 9, 09:25 UTC2h 25m
2026-07-08 ENT4XH - Jul 8, 11:35 UTCJul 8, 14:35 UTC3h 0m
2026-07-08 ENT6ZJ - Jul 8, 08:00 UTCJul 8, 10:20 UTC2h 20m
2026-07-07 ENT7JC - Jul 7, 16:25 UTCJul 7, 19:10 UTC2h 45m
2026-07-07 ENT5PJ - Jul 7, 12:40 UTCJul 7, 15:00 UTC2h 20m
2026-07-07 ENT7KG RHO → BSL Jul 7, 08:10 UTCJul 7, 11:20 UTC3h 10m
2026-07-07 ENT3ZP - Jul 7, 04:15 UTCJul 7, 06:55 UTC2h 40m
2026-07-06 ENT3RH - Jul 6, 09:15 UTCJul 6, 13:00 UTC3h 45m
2026-07-06 ENT4CA FUE → KTW Jul 6, 04:25 UTCJul 6, 08:10 UTC3h 45m
2026-07-05 ENT5MN - Jul 5, 18:35 UTCJul 5, 21:25 UTC2h 50m
2026-07-05 ENT9HP - Jul 5, 14:45 UTCJul 5, 17:10 UTC2h 25m
2026-07-05 ENT1CM - Jul 5, 09:40 UTCJul 5, 13:25 UTC3h 45m
2026-07-05 ENT2GD - Jul 5, 04:25 UTCJul 5, 08:20 UTC3h 55m
2026-07-04 ENT2WN - Jul 4, 17:40 UTCJul 4, 21:20 UTC3h 40m
2026-07-04 ENT7JY - Jul 4, 12:25 UTCJul 4, 16:15 UTC3h 50m
2026-07-04 ENT3PA RHO → BSL Jul 4, 08:00 UTCJul 4, 11:05 UTC3h 5m
2026-07-04 ENT5SF - Jul 4, 04:20 UTCJul 4, 06:55 UTC2h 35m
2026-07-03 ENT7WB KGS → BSL Jul 3, 11:15 UTCJul 3, 14:30 UTC3h 15m
2026-07-03 ENT6ZT - Jul 3, 07:15 UTCJul 3, 09:50 UTC2h 35m
2026-07-02 ENT8EM - Jul 2, 11:10 UTCJul 2, 13:55 UTC2h 45m
2026-07-02 ENT9BY - Jul 2, 07:00 UTCJul 2, 09:35 UTC2h 35m
2026-06-30 ENT6NC RHO → BSL Jun 30, 12:50 UTCJun 30, 15:55 UTC3h 5m
2026-06-30 ENT6EA - Jun 30, 10:45 UTCJun 30, 11:15 UTC30m
2026-06-30 ENT1TP - Jun 30, 06:40 UTCJun 30, 09:15 UTC2h 35m
2026-06-29 ENT509P - Jun 29, 13:00 UTCJun 29, 14:25 UTC1h 25m
2026-06-29 ENT509 GRZ → LTN Jun 29, 09:40 UTCJun 29, 11:35 UTC1h 55m
2026-06-29 ENT4WC OSL → GRZ Jun 29, 05:59 UTCJun 29, 08:19 UTC2h 20m
2026-06-28 ENT2GW - Jun 28, 06:10 UTCJun 28, 12:35 UTC6h 25m
2026-06-28 ENT501P - Jun 28, 03:55 UTCJun 28, 04:50 UTC55m
2026-06-27 ENT532 - Jun 27, 11:59 UTCJun 27, 19:49 UTC7h 50m
2026-06-26 ENT9ZP - Jun 26, 19:35 UTCJun 26, 22:25 UTC2h 50m
2026-06-26 ENT3AF - Jun 26, 15:20 UTCJun 26, 18:24 UTC3h 5m
2026-06-26 ENT9ZB - Jun 26, 12:19 UTCJun 26, 13:55 UTC1h 35m
2026-06-26 ENT8CH - Jun 26, 04:55 UTCJun 26, 06:54 UTC2h 0m
2026-06-26 ENT3HN - Jun 26, 01:45 UTCJun 26, 03:45 UTC2h 0m
2026-06-23 ENT4865 - Jun 23, 16:29 UTCJun 24, 01:30 UTC9h 0m

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 SP-ENV page for operator, model, and routing details .

Mode-S 4891B8 frequently asked

What is Mode-S code 4891B8?
4891B8 is an ICAO 24-bit transponder address. Allocated to Poland. Assigned to SP-ENV.
Where is Mode-S 4891B8 registered?
Mode-S code 4891B8 is allocated to Poland (PL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4891B8 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 4891B8, octal 22110670, decimal 4,755,896.
What flights does 4891B8 operate?
Mode-S 4891B8 has broadcast 20 distinct callsigns, including ENT7598, ENT501N, ENT8UY, ENT7344, ENT6RB.