Google · AI answers
Google-Read-Aloud
Identify Google-Read-Aloud by its user agent. Check request identity, review robots.txt controls and track visits in Aiola Analytics.
Key facts
User-agent token:
Google-Read-AloudAI answers: Fetched to answer a user's question now.
Google publishes official IP ranges; verify requests against them.
What Google-Read-Aloud is
Google-Read-Aloud renders pages for user-requested text-to-speech and may serve cached results. It cannot be disabled through robots.txt; Google's documented opt-out is the meta tag with name google and content nopagereadaloud.
In Aiola's taxonomy, AI answers means fetched to answer a user's question now.
Google-Read-Aloud user agent
Look for the match token inside the complete HTTP User-Agent header. Tokens can be spoofed, so use the network checks below for authentication.
Full example User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 (compatible; Google-Read-Aloud; +https://support.google.com/webmasters/answer/1061943)Case-insensitive match token
Google-Read-AloudOfficial IP ranges
Google publishes an official IP range list. This cached snapshot contains 504 CIDR prefixes, last fetched 2026-10-27. Open the live source
Official IP range snapshot
2001:4860:4801:4004::/64
2001:4860:4801:4008::/64
2001:4860:4801:4009::/64
2001:4860:4801:400f::/64
2001:4860:4801:4010::/64
2001:4860:4801:4015::/64
2001:4860:4801:4016::/64
2001:4860:4801:4017::/64
2001:4860:4801:4018::/64
2001:4860:4801:401a::/64
2001:4860:4801:401b::/64
2001:4860:4801:401c::/64
2001:4860:4801:4020::/64
2001:4860:4801:4021::/64
2001:4860:4801:4022::/64
2001:4860:4801:4023::/64
2001:4860:4801:4024::/64
2001:4860:4801:4025::/64
2001:4860:4801:4026::/64
2001:4860:4801:4027::/64
2001:4860:4801:4028::/64
2001:4860:4801:4029::/64
2001:4860:4801:402a::/64
2001:4860:4801:402b::/64
2001:4860:4801:4030::/64
2001:4860:4801:4031::/64
2001:4860:4801:4032::/64
2001:4860:4801:4033::/64
2001:4860:4801:4034::/64
2001:4860:4801:4035::/64
2001:4860:4801:4036::/64
2001:4860:4801:4037::/64
2001:4860:4801:4038::/64
2001:4860:4801:4039::/64
2001:4860:4801:403a::/64
2001:4860:4801:403b::/64
2001:4860:4801:403c::/64
2001:4860:4801:403d::/64
2001:4860:4801:403e::/64
2001:4860:4801:403f::/64
2001:4860:4801:4040::/64
2001:4860:4801:4041::/64
2001:4860:4801:4042::/64
2001:4860:4801:4043::/64
2001:4860:4801:4044::/64
2001:4860:4801:4045::/64
2001:4860:4801:4046::/64
2001:4860:4801:4047::/64
2001:4860:4801:4048::/64
2001:4860:4801:4049::/64
2001:4860:4801:404a::/64
2001:4860:4801:404b::/64
2001:4860:4801:404c::/64
2001:4860:4801:404d::/64
2001:4860:4801:404e::/64
2001:4860:4801:404f::/64
2001:4860:4801:4050::/64
2001:4860:4801:4051::/64
2001:4860:4801:4052::/64
2001:4860:4801:4053::/64
2001:4860:4801:4054::/64
2001:4860:4801:4055::/64
2001:4860:4801:4056::/64
2001:4860:4801:4057::/64
2001:4860:4801:4058::/64
2001:4860:4801:4059::/64
2001:4860:4801:405a::/64
2001:4860:4801:405b::/64
2001:4860:4801:405c::/64
2001:4860:4801:405d::/64
2001:4860:4801:405e::/64
2001:4860:4801:405f::/64
2001:4860:4801:4060::/64
2001:4860:4801:4061::/64
2001:4860:4801:4062::/64
2001:4860:4801:4063::/64
2001:4860:4801:4064::/64
2001:4860:4801:4065::/64
2001:4860:4801:4066::/64
2001:4860:4801:4067::/64
2001:4860:4801:4068::/64
2001:4860:4801:4069::/64
2001:4860:4801:406a::/64
2001:4860:4801:406b::/64
2001:4860:4801:406c::/64
2001:4860:4801:406d::/64
2001:4860:4801:406e::/64
2001:4860:4801:4070::/64
2001:4860:4801:4071::/64
2001:4860:4801:4072::/64
2001:4860:4801:4073::/64
2001:4860:4801:4074::/64
2001:4860:4801:4075::/64
2001:4860:4801:4076::/64
2001:4860:4801:4077::/64
2001:4860:4801:4078::/64
2001:4860:4801:4079::/64
2001:4860:4801:407a::/64
2001:4860:4801:407b::/64
2001:4860:4801:407c::/64
2001:4860:4801:407d::/64
2001:4860:4801:407e::/64
2001:4860:4801:407f::/64
2001:4860:4801:4080::/64
2001:4860:4801:4081::/64
2001:4860:4801:4082::/64
2001:4860:4801:4083::/64
2001:4860:4801:4084::/64
2001:4860:4801:4085::/64
2001:4860:4801:4086::/64
2001:4860:4801:4087::/64
2001:4860:4801:4088::/64
2001:4860:4801:4089::/64
2001:4860:4801:408a::/64
2001:4860:4801:408b::/64
2001:4860:4801:4090::/64
2001:4860:4801:4091::/64
2001:4860:4801:4092::/64
2001:4860:4801:4093::/64
2001:4860:4801:4094::/64
2001:4860:4801:4095::/64
2001:4860:4801:4096::/64
2001:4860:4801:40a0::/64
2001:4860:4801:40a1::/64
2001:4860:4801:40a2::/64
2001:4860:4801:40a3::/64
2001:4860:4801:40a4::/64
2001:4860:4801:40b0::/64
2001:4860:4801:40b1::/64
2001:4860:4801:40b2::/64
2001:4860:4801:40b3::/64
2001:4860:4801:40b4::/64
2001:4860:4801:40b5::/64
2001:4860:4801:40b6::/64
2001:4860:4801:40b7::/64
2001:4860:4801:40b8::/64
2001:4860:4801:40b9::/64
2001:4860:4801:40ba::/64
2001:4860:4801:40c0::/64
2001:4860:4801:40c1::/64
2001:4860:4801:40c2::/64
2001:4860:4801:40c3::/64
2001:4860:4801:40c4::/64
2001:4860:4801:40c5::/64
2001:4860:4801:40c6::/64
2001:4860:4801:40d0::/64
2001:4860:4801:40d1::/64
2001:4860:4801:40d2::/64
2001:4860:4801:40d3::/64
2001:4860:4801:40d4::/64
2001:4860:4801:40d5::/64
2001:4860:4801:40d6::/64
2001:4860:4801:40d7::/64
2001:4860:4801:40d8::/64
2001:4860:4801:40d9::/64
2001:4860:4801:40da::/64
2001:4860:4801:40db::/64
2001:4860:4801:40dc::/64
2001:4860:4801:40dd::/64
2001:4860:4801:40de::/64
2001:4860:4801:40df::/64
2001:4860:4801:40e0::/64
2001:4860:4801:40e1::/64
2001:4860:4801:40e2::/64
2001:4860:4801:40e3::/64
2001:4860:4801:40f0::/64
2001:4860:4801:40f1::/64
2001:4860:4801:40f2::/64
2001:4860:4801:40f3::/64
2001:4860:4801:40f4::/64
2001:4860:4801:40f5::/64
2001:4860:4801:40f6::/64
2001:4860:4801:40f7::/64
2001:4860:4801:40f8::/64
2001:4860:4801:40f9::/64
2001:4860:4801:40fa::/64
2001:4860:4801:40fb::/64
2001:4860:4801:40fc::/64
2001:4860:4801:40fd::/64
2001:4860:4801:40fe::/64
2001:4860:4801:40ff::/64
2001:4860:4801:4100::/64
2001:4860:4801:4101::/64
2001:4860:4801:4102::/64
2001:4860:4801:4103::/64
2001:4860:4801:4104::/64
2001:4860:4801:4105::/64
2001:4860:4801:4106::/64
2001:4860:4801:4107::/64
2001:4860:4801:4110::/64
2001:4860:4801:4111::/64
2001:4860:4801:4112::/64
2001:4860:4801:4113::/64
2001:4860:4801:4114::/64
2001:4860:4801:4120::/64
2001:4860:4801:4121::/64
2001:4860:4801:4122::/64
2001:4860:4801:4123::/64
2001:4860:4801:4124::/64
2001:4860:4801:4125::/64
2001:4860:4801:4126::/64
2001:4860:4801:4127::/64
2001:4860:4801:4128::/64
2001:4860:4801:4129::/64
2001:4860:4801:412a::/64
2001:4860:4801:412b::/64
2001:4860:4801:412c::/64
2001:4860:4801:412d::/64
2001:4860:4801:412e::/64
2001:4860:4801:412f::/64
2001:4860:4801:4130::/64
2001:4860:4801:4131::/64
2001:4860:4801:4132::/64
2001:4860:4801:4133::/64
2001:4860:4801:4134::/64
2001:4860:4801:4135::/64
2001:4860:4801:4136::/64
2001:4860:4801:4140::/64
2001:4860:4801:4141::/64
2001:4860:4801:4142::/64
2001:4860:4801:4143::/64
2001:4860:4801:4144::/64
2001:4860:4801:4145::/64
2001:4860:4801:4146::/64
2001:4860:4801:4147::/64
2001:4860:4801:4150::/64
2001:4860:4801:4151::/64
2001:4860:4801:4152::/64
2001:4860:4801:4153::/64
2001:4860:4801:4154::/64
2001:4860:4801:4155::/64
2001:4860:4801:4156::/64
2001:4860:4801:4157::/64
2001:4860:4801:4158::/64
2001:4860:4801:4159::/64
2001:4860:4801:415a::/64
2001:4860:4801:415b::/64
2001:4860:4801:415c::/64
2001:4860:4801:415d::/64
2001:4860:4801:415e::/64
2001:4860:4801:4160::/64
2001:4860:4801:4161::/64
2001:4860:4801:4162::/64
2001:4860:4801:4163::/64
2001:4860:4801:4164::/64
2001:4860:4801:4165::/64
2001:4860:4801:4166::/64
2001:4860:4801:4167::/64
2001:4860:4801:4168::/64
2001:4860:4801:4169::/64
2001:4860:4801:416a::/64
2001:4860:4801:416b::/64
142.250.32.0/27
142.250.32.128/27
142.250.32.160/27
142.250.32.192/27
142.250.32.224/27
142.250.32.32/27
142.250.32.64/27
142.250.32.96/27
142.250.33.0/27
142.250.33.128/27
142.250.33.32/27
142.250.33.64/27
142.250.33.96/27
172.253.180.0/27
172.253.180.32/27
172.253.180.64/27
172.253.181.0/27
172.253.181.128/27
172.253.181.160/27
172.253.181.192/27
172.253.181.224/27
172.253.181.32/27
172.253.181.64/27
172.253.181.96/27
172.253.182.0/27
172.253.182.128/27
172.253.182.32/27
172.253.182.64/27
172.253.182.96/27
172.253.183.0/27
172.253.183.128/27
172.253.183.160/27
172.253.183.192/27
172.253.183.224/27
172.253.183.32/27
172.253.183.64/27
172.253.183.96/27
192.178.10.0/27
192.178.10.128/27
192.178.10.32/27
192.178.10.64/27
192.178.10.96/27
192.178.11.0/27
192.178.11.128/27
192.178.11.160/27
192.178.11.192/27
192.178.11.224/27
192.178.11.32/27
192.178.11.64/27
192.178.11.96/27
192.178.12.0/27
192.178.12.128/27
192.178.12.160/27
192.178.12.192/27
192.178.12.32/27
192.178.12.64/27
192.178.12.96/27
192.178.13.0/27
192.178.13.128/27
192.178.13.160/27
192.178.13.192/27
192.178.13.224/27
192.178.13.32/27
192.178.13.64/27
192.178.13.96/27
192.178.14.0/27
192.178.15.0/27
192.178.15.128/27
192.178.15.160/27
192.178.15.192/27
192.178.15.224/27
192.178.15.32/27
192.178.15.64/27
192.178.15.96/27
192.178.8.0/27
192.178.8.128/27
192.178.8.32/27
192.178.8.64/27
192.178.8.96/27
192.178.9.0/27
192.178.9.128/27
192.178.9.160/27
192.178.9.192/27
192.178.9.224/27
192.178.9.32/27
192.178.9.64/27
192.178.9.96/27
64.233.172.0/27
64.233.172.128/27
64.233.172.160/27
64.233.172.192/27
64.233.172.224/27
64.233.172.32/27
64.233.172.64/27
64.233.172.96/27
64.233.173.0/27
64.233.173.128/27
64.233.173.160/27
64.233.173.192/27
64.233.173.224/27
64.233.173.32/27
64.233.173.64/27
64.233.173.96/27
66.102.6.0/27
66.102.6.128/27
66.102.6.160/27
66.102.6.192/27
66.102.6.224/27
66.102.6.32/27
66.102.6.64/27
66.102.6.96/27
66.102.7.0/27
66.102.7.128/27
66.102.7.160/27
66.102.7.192/27
66.102.7.224/27
66.102.7.32/27
66.102.7.64/27
66.102.7.96/27
66.102.8.0/27
66.102.8.128/27
66.102.8.160/27
66.102.8.192/27
66.102.8.224/27
66.102.8.32/27
66.102.8.64/27
66.102.8.96/27
66.102.9.0/27
66.102.9.128/27
66.102.9.160/27
66.102.9.192/27
66.102.9.224/27
66.102.9.32/27
66.102.9.64/27
66.102.9.96/27
66.249.80.0/27
66.249.80.128/27
66.249.80.160/27
66.249.80.192/27
66.249.80.224/27
66.249.80.32/27
66.249.80.64/27
66.249.80.96/27
66.249.81.0/27
66.249.81.128/27
66.249.81.160/27
66.249.81.192/27
66.249.81.224/27
66.249.81.32/27
66.249.81.64/27
66.249.81.96/27
66.249.82.0/27
66.249.82.128/27
66.249.82.160/27
66.249.82.192/27
66.249.82.224/27
66.249.82.32/27
66.249.82.64/27
66.249.82.96/27
66.249.83.0/27
66.249.83.128/27
66.249.83.160/27
66.249.83.192/27
66.249.83.224/27
66.249.83.32/27
66.249.83.64/27
66.249.83.96/27
66.249.84.0/27
66.249.84.128/27
66.249.84.160/27
66.249.84.192/27
66.249.84.224/27
66.249.84.32/27
66.249.84.64/27
66.249.84.96/27
66.249.85.0/27
66.249.85.128/27
66.249.85.160/27
66.249.85.32/27
66.249.85.64/27
66.249.85.96/27
66.249.88.0/27
66.249.88.128/27
66.249.88.160/27
66.249.88.192/27
66.249.88.224/27
66.249.88.32/27
66.249.88.64/27
66.249.88.96/27
66.249.93.0/27
66.249.93.128/27
66.249.93.160/27
66.249.93.192/27
66.249.93.224/27
66.249.93.32/27
66.249.93.64/27
66.249.93.96/27
74.125.208.0/27
74.125.208.128/27
74.125.208.160/27
74.125.208.192/27
74.125.208.224/27
74.125.208.32/27
74.125.208.64/27
74.125.208.96/27
74.125.209.0/27
74.125.209.128/27
74.125.209.160/27
74.125.209.192/27
74.125.209.32/27
74.125.209.64/27
74.125.209.96/27
74.125.210.0/27
74.125.210.128/27
74.125.210.160/27
74.125.210.192/27
74.125.210.224/27
74.125.210.32/27
74.125.210.64/27
74.125.210.96/27
74.125.211.0/27
74.125.211.32/27
74.125.211.64/27
74.125.211.96/27
74.125.212.0/27
74.125.212.128/27
74.125.212.160/27
74.125.212.192/27
74.125.212.224/27
74.125.212.32/27
74.125.212.64/27
74.125.212.96/27
74.125.213.0/27
74.125.213.32/27
74.125.213.64/27
74.125.213.96/27
74.125.214.0/27
74.125.214.128/27
74.125.214.160/27
74.125.214.192/27
74.125.214.224/27
74.125.214.32/27
74.125.214.64/27
74.125.214.96/27
74.125.215.0/27
74.125.215.128/27
74.125.215.160/27
74.125.215.192/27
74.125.215.224/27
74.125.215.32/27
74.125.215.64/27
74.125.215.96/27Verify a Google-Read-Aloud request
For Google-Read-Aloud, compare the source IP from your trusted edge or server against Google’s current published prefixes.
Test one CIDR in Python (replace REQUEST_IP)
python3 -c 'import ipaddress; print(ipaddress.ip_address("REQUEST_IP") in ipaddress.ip_network("2001:4860:4801:4004::/64"))'Test every current prefix in the vendor feed and re-fetch it regularly. This cached snapshot is evidence of publication, not a permanent firewall list.
Control Google-Read-Aloud with robots.txt
Google-Read-Aloud is user-triggered. Google's controls may differ from automated crawling, so do not assume a robots.txt block is an authentication boundary.
Allow Google-Read-Aloud
User-agent: Google-Read-Aloud
Allow: /Block Google-Read-Aloud
User-agent: Google-Read-Aloud
Disallow: /Aiola Analytics
See every Google-Read-Aloud visit on your site
Aiola tracks 70 AI, search and link-preview crawlers next to your human traffic. See when Google-Read-Aloud arrives, which pages it requests and how that changes over time. Hosted Analytics needs Pro or a trial.
Common questions
Build, ship and fix in one app
Errors, user feedback, GitHub and analytics live next to your coding agents in one desktop app. Every issue becomes a task an agent can take.