Sogou IP ranges

I haven't found any documentation on how to validate sogou crawler, except a list of IP ranges here: https://www.distilnetworks.com/bot-directory/bot/sogou-spider/

I'm having traffic with sogou user agent from:

- 220.181.x.x
- 103.38.x.x
- 123.126.x.x

Anyone with feedback or more info?
Would be nice to verify this one!