This list includes some of the FQDNs and IP Addresses used by Apple Services, this may be useful for identifying outgoing traffic and creating web filtering exceptions.

104.106.197.66
104.16.65.50
104.16.66.50
104.86.110.83
17.171.98.3
17.188.182.196
17.188.22.91
17.188.23.49
17.250.80.100
17.250.80.11
17.250.80.141
17.250.80.144
17.250.80.15
17.253.29.199
17.253.29.203
17.253.37.206
17.253.37.209
17.57.146.5
17.57.146.6
17.57.146.86
17.57.146.87
17.57.146.88
17.57.172.11
17.57.172.16
23.215.181.103
23.5.208.22
35.181.25.252
52.18.143.40
54.220.133.225
92.122.149.120
api.smoot.apple.com
api-ausw2b.smoot.apple.com
api-glb-aeuw3c.smoot.apple.com
apple.com
caldav.icloud.com
cdn.apple.com
cl1.apple.com
cl3.apple.com
cl4.apple.com
configuration.ls.apple.com
contacts.icloud.com
courier.push.apple.com
fmfmobile.icloud.com
gateway.icloud.com
gdmf.apple.com
gs-loc.apple.com
gsp10-ssl.apple.com
gsp64-ssl.ls.apple.com
gsp85-ssl.ls.apple.com
gspe19-ssl.ls.apple.com
gspe35-ssl.ls.apple.com
gsp-ssl.ls.apple.com
guzzoni.apple.com
init.itunes.apple.com
init.push.apple.com
init-p01st.push.apple.com
iphone-cdn-api.fitbit.com
iphone-cdn-client.fitbit.com
iphone-ld.apple.com
iphonesubmissions.apple.com
itunes.apple.com
km.support.apple.com
mesu.apple.com
news-edge.apple.com
ocsp2.apple.com
p21-caldav.icloud.com
p72-contacts.icloud.com
p72-fmfmobile.icloud.com
securemetrics.apple.com
setup.icloud.com
smp-device-content.apple.com
support.apple.com
supportmetrics.apple.com
swcatalog.apple.com
swdist.apple.com
weather-data.apple.com
www.apple.com
xp.apple.com
xp-cdn.apple.com