Yes! Quite easily, but it requires thinking through the right API design. I'll see if I can work this in this weekend.

You can use https://bgp.tools for that (e.g. https://bgp.tools/as/200676#prefixes)

Curious, is that your AS?

Yup

Disclaimer I work for IPinfo.

If you can download the free IPinfo IP to ASN database CSV file. You can run the following command to get the IP ranges of an ASN.

```

grep AS19551 asn.csv | ipinfo range2cidr | cut -f1 -d ','

```

You will need to install the IPinfo CLI to convert the IP range to their CIDR equivalent. I believe the range2cidr command is also available as a standalone binary as well.

After that, you might want to aggregate the IP ranges to bigger ranges. I have used this in the past for this:

https://github.com/job/aggregate6

I didn't know ipinfo had a cli, good to know, i'll have a Look. Thank you!

I'm currently using ipset, that does aggregation if I remember correctly, but aggregate6 looks good!

The CLI has a bunch of features. I highly recommend checking out the `help` output for the CLI. Personally, I use the `grepip`, `bulk`, and `summarize` commands on a daily basis.

Here's a simpler alternative with IP Guide that doesn't require a CLI:

  curl -sL ip.guide/AS19551 | jq .routes

In addition to other tools, there's also https://bgp.he.net which has a page for announced prefixes. Sometimes it's useful to use multiple tools, as not everyone will see all announcements or process them the same.

At the moment, https://bgp.tools/ is my favourite goto for ASN/BGP-related information. They operate route collectors on quite a few internet exchanges, collecting BGP routing information from peers connected on those IXes, as well as route servers. They offer near-realtime insight in what prefixes are actually announced/visible, as well as prefixes that have been allocated, but are not announced.

There's even more under the hood, worth checking it out.

Disclaimer: I work at BigDataCloud.

You can try our ASN lookup tool: https://www.bigdatacloud.com/asn-lookup/

It provide wide variety of data objects, and also provide map view where possible to showcase the active region of operation ( its a unique feature of the API), plus heaps of data. You can test the API for free and access all the data objects.

Any doubts or queries, please let me know.