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: 3.160.5.32
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.22
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.69
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 3.160.5.11
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:4600:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:4400:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:2a00: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:ec00:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:6400:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:0:e:9204:dc80:93a1
Name:	d3nz26vdvbyquq.cloudfront.net
Address: 2600:9000:25f4:1e00:e:9204:dc80:93a1