shell:$ nslookup -timeout=2 -retry=1 'ofpptcasa-my.sharepoint.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
ofpptcasa-my.sharepoint.com	canonical name = 1619-ipv4v6c.clump.dprodmgd104.aa-rt.sharepoint.com.
1619-ipv4v6c.clump.dprodmgd104.aa-rt.sharepoint.com	canonical name = 189915-ipv4v6c.farm.dprodmgd104.aa-rt.sharepoint.com.
189915-ipv4v6c.farm.dprodmgd104.aa-rt.sharepoint.com	canonical name = 189915-ipv4v6e.farm.dprodmgd104.sharepointonline.com.akadns.net.
189915-ipv4v6e.farm.dprodmgd104.sharepointonline.com.akadns.net	canonical name = 189915-ipv4v6.farm.dprodmgd104.aa-rt.sharepoint.com.dual-spo-0005.spo-msedge.net.
189915-ipv4v6.farm.dprodmgd104.aa-rt.sharepoint.com.dual-spo-0005.spo-msedge.net	canonical name = dual-spo-0005.spo-msedge.net.
Name:	dual-spo-0005.spo-msedge.net
Address: 13.107.138.10
Name:	dual-spo-0005.spo-msedge.net
Address: 13.107.136.10
Name:	dual-spo-0005.spo-msedge.net
Address: 2620:1ec:8fa::10
Name:	dual-spo-0005.spo-msedge.net
Address: 2620:1ec:8f8::10