Table of Contents

Blocklists - Google

All

android.clients.google.com
app-measurement.com
clients1.google.com
clients2.google.com
clients3.google.com
clients4.google.com 
clients5.google.com
clients6.google.com
connectivitycheck.android.com
connectivitycheck.gstatic.com 
dl.google.com
googleapis.l.google.com
google.com
www.google.com
.sites.google.com
.www3.l.google.com

Connectivity Checks

These domains are checked by the operating systems when connecting via wifi, and if they do not get the response they expect, they may try to open a WiFi login page or similar as they believe they are located behind a captive portal.

android.clients.google.com
clients3.google.com
connectivitycheck.android.com
connectivitycheck.gstatic.com 

Gmail (Google Mail)

googleapis.l.google.com

Google Chrome

dl.google.com # to update.

Google Maps

clients2.google.com
clients4.google.com 

To load google maps data (photos, maps, locations, location info, etc) until reaching a timeout (15-20 seconds):

app-measurement.com

Google Play

android.clients.google.com

Might also need:

clients1.google.com
clients2.google.com
clients3.google.com
clients4.google.com
clients5.google.com
clients6.google.com

Google Services

clients2.google.com
clients4.google.com 
google.com
www.google.com
.sites.google.com
.www3.l.google.com # CNAME for (sites.google.com)