sensors Mode-S transponder
4CC581
ICAO 24-bit transponder address
Currently assigned to TF-IAD · AIRBUS A-321neo
- Hex
- 4CC581
- Octal
- 23142601
- Decimal
- 5,031,297
- Tail
- TF-IAD
- Type
- A21N
Broadcasting now · callsign ICE665 · 32,000 ft
- Flights observed
- 158
- Distinct callsigns
- 20
- Country
- -
- Last broadcast
- 34m ago
Current position
Callsign history 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| ICE820 | Icelandair | 13 | 2026-05-18 |
| ICE665 | Icelandair | 11 | 2026-05-29 |
| ICE821 | Icelandair | 9 | 2026-05-17 |
| ICE664 | Icelandair | 9 | 2026-05-28 |
| ICE501 | Icelandair | 8 | 2026-05-29 |
| ICE500 | Icelandair | 8 | 2026-05-29 |
| ICE614 | Icelandair | 7 | 2026-05-10 |
| ICE615 | Icelandair | 6 | 2026-05-09 |
| ICE451 | Icelandair | 6 | 2026-05-23 |
| ICE450 | Icelandair | 6 | 2026-05-23 |
| ICE689 | Icelandair | 4 | 2026-05-26 |
| ICE686 | Icelandair | 4 | 2026-05-27 |
| ICE274 | Icelandair | 4 | 2026-05-04 |
| ICE623 | Icelandair | 3 | 2026-05-25 |
| ICE580 | Icelandair | 3 | 2026-05-14 |
| ICE419 | Icelandair | 3 | 2026-05-09 |
| ICE418 | Icelandair | 3 | 2026-05-09 |
| ICE319 | Icelandair | 3 | 2026-05-10 |
| ICE318 | Icelandair | 3 | 2026-05-10 |
| ICE307 | Icelandair | 3 | 2026-05-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | ICE665 | KEF → PDX | May 29, 17:25 UTC | May 30, 00:15 UTC | 6h 50m |
| 2026-05-29 | ICE501 | AMS → KEF | May 29, 12:45 UTC | May 29, 15:35 UTC | 2h 50m |
| 2026-05-29 | ICE500 | KEF → AMS | May 29, 08:25 UTC | May 29, 11:10 UTC | 2h 45m |
| 2026-05-28 | ICE664 | PDX → KEF | May 28, 23:55 UTC | May 29, 07:00 UTC | 7h 5m |
| 2026-05-28 | ICE663 | KEF → PDX | May 28, 10:55 UTC | May 28, 18:40 UTC | 7h 45m |
| 2026-05-28 | ICE201 | CPH → KEF | May 28, 05:35 UTC | May 28, 08:50 UTC | 3h 15m |
| 2026-05-28 | ICE202 | KEF → CPH | May 28, 01:10 UTC | May 28, 03:45 UTC | 2h 35m |
| 2026-05-27 | ICE85V | ALC → KEF | May 27, 17:35 UTC | May 27, 21:55 UTC | 4h 20m |
| 2026-05-27 | ICE84H | KEF → ALC | May 27, 11:15 UTC | May 27, 15:20 UTC | 4h 5m |
| 2026-05-27 | ICE686 | MCO → KEF | May 27, 02:19 UTC | May 27, 09:00 UTC | 6h 40m |
| 2026-05-26 | ICE689 | KEF → MCO | May 26, 17:04 UTC | May 27, 00:25 UTC | 7h 20m |
| 2026-05-26 | ICE7J | CDG → KEF | May 26, 12:30 UTC | May 26, 15:45 UTC | 3h 15m |
| 2026-05-26 | ICE8K | KEF → CDG | May 26, 07:59 UTC | May 26, 11:05 UTC | 3h 5m |
| 2026-05-26 | ICE622 | EWR → KEF | May 26, 00:39 UTC | May 26, 05:45 UTC | 5h 5m |
| 2026-05-25 | ICE623 | KEF → EWR | May 25, 21:30 UTC | May 25, 23:10 UTC | 1h 40m |
| 2026-05-25 | ICE623 | KEF → EWR | May 25, 17:25 UTC | May 25, 17:40 UTC | 15m |
| 2026-05-25 | ICE537 | MUC → KEF | May 25, 12:10 UTC | May 25, 16:05 UTC | 3h 55m |
| 2026-05-25 | ICE536 | KEF → MUC | May 25, 07:45 UTC | May 25, 11:00 UTC | 3h 15m |
| 2026-05-24 | ICE99K | CPH → KEF | May 24, 15:20 UTC | May 24, 18:30 UTC | 3h 10m |
| 2026-05-24 | ICE98C | KEF → CPH | May 24, 11:00 UTC | May 24, 13:30 UTC | 2h 30m |
| 2026-05-24 | ICE686 | MCO → KEF | May 24, 02:25 UTC | May 24, 09:30 UTC | 7h 5m |
| 2026-05-23 | ICE689 | KEF → MCO | May 23, 17:05 UTC | May 24, 00:25 UTC | 7h 20m |
| 2026-05-23 | ICE451 | LHR → KEF | May 23, 12:55 UTC | May 23, 15:35 UTC | 2h 40m |
| 2026-05-23 | ICE450 | KEF → LHR | May 23, 08:30 UTC | May 23, 11:05 UTC | 2h 35m |
| 2026-05-23 | ICE622 | EWR → KEF | May 23, 01:50 UTC | May 23, 07:10 UTC | 5h 20m |
| 2026-05-22 | ICE623 | KEF → EWR | May 22, 18:40 UTC | May 23, 00:05 UTC | 5h 25m |
| 2026-05-22 | ICE29E | MAN → KEF | May 22, 15:05 UTC | May 22, 17:20 UTC | 2h 15m |
| 2026-05-22 | ICE28T | KEF → MAN | May 22, 11:10 UTC | May 22, 13:35 UTC | 2h 25m |
| 2026-05-22 | ICE686 | MCO → KEF | May 22, 02:35 UTC | May 22, 09:20 UTC | 6h 45m |
| 2026-05-21 | ICE689 | KEF → MCO | May 21, 17:05 UTC | May 22, 00:25 UTC | 7h 20m |
| 2026-05-21 | ICE662 | PDX → KEF | May 21, 05:25 UTC | May 21, 13:01 UTC | 7h 35m |
| 2026-05-20 | ICE665 | KEF → PDX | May 20, 19:25 UTC | May 21, 02:55 UTC | 7h 30m |
| 2026-05-20 | ICE205 | CPH → KEF | May 20, 15:15 UTC | May 20, 17:55 UTC | 2h 40m |
| 2026-05-20 | ICE205 | CPH → KEF | May 20, 13:00 UTC | May 20, 13:50 UTC | 50m |
| 2026-05-20 | ICE204 | KEF → CPH | May 20, 08:35 UTC | May 20, 11:25 UTC | 2h 50m |
| 2026-05-19 | ICE664 | PDX → KEF | May 19, 22:55 UTC | May 20, 06:25 UTC | 7h 31m |
| 2026-05-18 | ICE665 | KEF → PDX | May 18, 17:15 UTC | May 19, 00:45 UTC | 7h 29m |
| 2026-05-18 | ICE501 | AMS → KEF | May 18, 12:35 UTC | May 18, 15:20 UTC | 2h 45m |
| 2026-05-18 | ICE500 | KEF → AMS | May 18, 08:05 UTC | May 18, 10:45 UTC | 2h 40m |
| 2026-05-18 | ICE820 | RDU → KEF | May 18, 06:20 UTC | May 18, 06:40 UTC | 20m |
| 2026-05-18 | ICE820 | RDU → KEF | May 18, 00:40 UTC | May 18, 03:10 UTC | 2h 30m |
| 2026-05-17 | ICE821 | KEF → RDU | May 17, 16:50 UTC | May 17, 23:10 UTC | 6h 20m |
| 2026-05-17 | ICE451 | LHR → KEF | May 17, 12:35 UTC | May 17, 15:15 UTC | 2h 40m |
| 2026-05-17 | ICE450 | KEF → LHR | May 17, 07:50 UTC | May 17, 10:30 UTC | 2h 40m |
| 2026-05-17 | ICE664 | PDX → KEF | May 17, 05:40 UTC | May 17, 06:00 UTC | 20m |
| 2026-05-16 | ICE664 | PDX → KEF | May 16, 22:40 UTC | May 17, 00:45 UTC | 2h 5m |
| 2026-05-15 | ICE665 | KEF → PDX | May 15, 17:20 UTC | May 16, 00:55 UTC | 7h 35m |
| 2026-05-15 | ICE501 | AMS → KEF | May 15, 13:00 UTC | May 15, 15:55 UTC | 2h 54m |
| 2026-05-15 | ICE500 | KEF → AMS | May 15, 08:25 UTC | May 15, 11:10 UTC | 2h 45m |
| 2026-05-14 | ICE581 | TFS → KEF | May 14, 17:15 UTC | May 14, 22:40 UTC | 5h 25m |
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 TF-IAD page for operator, model, and routing details .
Mode-S 4CC581 frequently asked
What is Mode-S code 4CC581?
4CC581 is an ICAO 24-bit transponder address. Assigned to TF-IAD.
Is 4CC581 broadcasting right now?
Yes. Mode-S 4CC581 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CC581, octal 23142601, decimal 5,031,297.