shell:$ nslookup -timeout=2 -retry=1 'app.cdn.91app.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
app.cdn.91app.com	canonical name = d3nz26vdvbyquq.cloudfront.net.
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.11
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.32
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.22
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.69
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:e400:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:5000:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:1a00:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:ce00:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:d200:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:d000:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:8800:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:be00:e:9204:dc80:93a1