$ geoiplookup ipinfo.tw
GeoIP Country Edition: SG, Singapore
GeoIP City Edition, Rev 1: SG, 00, N/A, Singapore, 62, 1.307700, 103.681801, 0, 0
GeoIP ASNum Edition: AS14061 DIGITALOCEAN-ASN
$ nslookup ipinfo.tw
Server: 127.0.0.1
Address: 127.0.0.1#53
Non-authoritative answer:
Name: ipinfo.tw
Address: 188.166.199.140
Name: ipinfo.tw
Address: 2400:6180:0:d1::4fc:4001
ipinfo.tw is hosted on DigitalOcean Singapore region that are facing network connectivity issue more than 3 weeks now, there is no simple solution to this, but maybe need to move the droplet instance to another region, or switch to another VPS.