How long does it take for an iOS app to recognize a DNS change?

Question

I recently changed the DNS records for a domain name to point to a new IP. An iPhone app of mine that pings this domain doesn't seem to be picking up the change, although my desktop web browser quickly picked up the new IP. How long does it take for an iPhone to flush its DNS cache for a particular domain and detect that the DNS records have changed?

Answer 1

I had this problem I just did two steps:

Step 1 - Turn off iPhone

Step 2 - Turn on Phone, Reload page.

Otherwise I've read it takes about 24 hours for a DNS refresh to occur on the iPhone.