# Falcon regions & endpoints (/falcon/regions)

> The nine Falcon metros for Solana transaction submission, with the exact host and port for JSON-RPC, HTTP, QUIC and native UDP.



Falcon runs in **nine metros**, and every host follows the same pattern: `<region>.falcon.wtf`.

| Metro               | Code  | Falcon host      |
| ------------------- | ----- | ---------------- |
| 🇩🇪 Frankfurt      | `fra` | `fra.falcon.wtf` |
| 🇳🇱 Amsterdam      | `ams` | `ams.falcon.wtf` |
| 🇬🇧 London         | `lon` | `lon.falcon.wtf` |
| 🇺🇸 New York       | `nyc` | `nyc.falcon.wtf` |
| 🇯🇵 Tokyo          | `tyo` | `tyo.falcon.wtf` |
| 🇮🇪 Dublin         | `dub` | `dub.falcon.wtf` |
| 🇸🇬 Singapore      | `sgp` | `sgp.falcon.wtf` |
| 🇺🇸 Salt Lake City | `slc` | `slc.falcon.wtf` |
| 🇱🇹 Šiauliai       | `sqq` | `sqq.falcon.wtf` |

Solana RPC covers five of these nine metros; the [cross-product matrix](/platform/regions) lays it out.

## Ports by transport

| Transport         | Endpoint                               | Protocol |
| ----------------- | -------------------------------------- | -------- |
| JSON-RPC          | `http://<region>.falcon.wtf`           | TCP 80   |
| HTTP `/binary`    | `http://<region>.falcon.wtf/binary`    | TCP 80   |
| HTTP `/plaintext` | `http://<region>.falcon.wtf/plaintext` | TCP 80   |
| QUIC              | `<region>.falcon.wtf:5000`             | UDP 5000 |
| Native UDP        | `<region>.falcon.wtf:9000`             | UDP 9000 |

Frankfurt, in full:

```text
JSON-RPC:  http://fra.falcon.wtf?api-key=YOUR_API_KEY_UUID
/binary:   http://fra.falcon.wtf/binary?api-key=YOUR_API_KEY_UUID
QUIC:      fra.falcon.wtf:5000
UDP:       fra.falcon.wtf:9000
```

Your egress firewall needs outbound TCP 80, plus outbound UDP 5000 and/or 9000 with return traffic allowed for the QUIC connection. If you need a fixed source port for someone else's allowlist, `falcon-client` can bind a local address at connect time.

## Choosing a region

Pick on round-trip time from the host that actually submits. Time a `getVersion` call against two or three candidates and take the winner. Your API key, the [tip accounts](/falcon/tips), the minimum tip and your allowance are the same in every metro, so nothing changes when you switch region.

## Troubleshoot a connection

| Symptom                                                                     | Cause                                                                                                                           | Fix                                                                                                |
| --------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| HTTP connects but every call is `401`                                       | Missing or malformed `api-key`, or a revoked key                                                                                | Test with `getVersion`; the key is a UUID                                                          |
| QUIC connects then closes with `Connection limit reached...`                | Too many concurrent connections for the key                                                                                     | Reuse one client                                                                                   |
| UDP sends succeed but nothing ever lands                                    | Wrong port, malformed frame, missing tip, or an invalid transaction                                                             | Replay the same transaction over JSON-RPC to see the real error ([Falcon native UDP](/falcon/udp)) |
| Raw bytes to `/binary` or `/plaintext` answered with a JSON-RPC parse error | The path was mistyped. Anything that isn't exactly `/binary` or `/plaintext` is handled as JSON-RPC; there's no 404 to warn you | Check the path spelling                                                                            |

If access problems persist, ask on [Discord](https://discord.gg/corvus-labs); never post your API key, or a full URL containing it.