diff --git a/download_imageset.py b/download_imageset.py
index ebe53cd..6c804be 100755
--- a/download_imageset.py
+++ b/download_imageset.py
@@ -391,6 +391,9 @@ def filehost_cmd(urls: tuple[str, ...], name: str | None, cwd: Path, token: str)
 
     _extract_and_process(output_dir)
 
+def is_filehost(url: str) -> bool:
+    kws = ["rg.to", "rapidgator.net", "trbt.cc"]
+    return any(kw in url for kw in kws)
 
 @cli.command("download")
 @click.argument("urls", nargs=-1, required=True)
@@ -401,7 +404,7 @@ def filehost_cmd(urls: tuple[str, ...], name: str | None, cwd: Path, token: str)
 def download_cmd(
     ctx: click.Context, urls: tuple[str, ...], name: str | None, cwd: Path, token: str
 ) -> None:
-    filehost_urls = [u for u in urls if "rg.to" in u or "rapidgator.net" in u]
+    filehost_urls = [u for u in urls if is_filehost(u)]
     gallery_urls = [u for u in urls if u not in set(filehost_urls)]
     if filehost_urls:
         ctx.invoke(filehost_cmd, urls=tuple(filehost_urls), name=name, cwd=cwd, token=token)