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Microsoft

Bingbot

IndexingPublished CIDRsVerified July 2026

What it is

Bingbot crawls and renders pages for the Bing index, which also supplies results to Microsoft Copilot. Aiola classifies it as indexing because it supports a searchable retrieval index.

In Aiola's taxonomy, Indexing means crawled for ai or search indexing.

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 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
Case-insensitive match token
Bingbot

Official IP ranges

Microsoft publishes an official JSON feed. This cached snapshot contains 28 CIDR prefixes, last fetched 2026-07-11. Open the live source ↗

Bingbot CIDRs — snapshot fetched 2026-07-11
13.66.139.0/24
13.66.144.0/24
13.67.10.16/28
13.69.66.240/28
13.71.172.224/28
139.217.52.0/28
157.55.39.0/24
191.233.204.224/28
199.30.24.0/23
20.125.163.80/28
20.15.133.160/27
20.36.108.32/28
20.43.120.16/28
20.74.197.0/28
20.79.107.240/28
207.46.13.0/24
40.77.139.0/25
40.77.167.0/24
40.77.177.0/24
40.77.178.0/23
40.77.188.0/22
40.77.202.0/24
40.79.131.208/28
40.79.186.176/28
51.105.67.0/28
52.167.144.0/24
52.231.148.0/28
65.55.210.0/24

Verify authenticity

Start with the source IP recorded by your trusted edge or server, not an untrusted forwarded header.

Test one CIDR in Python (replace REQUEST_IP)
python3 -c 'import ipaddress; print(ipaddress.ip_address("REQUEST_IP") in ipaddress.ip_network("13.66.139.0/24"))'
Reverse- and forward-DNS double lookup
host REQUEST_IP
# Confirm the hostname ends in an official suffix
host RETURNED_HOSTNAME
# The forward lookup must return REQUEST_IP

For production checks, test against every current prefix in the vendor feed. Re-fetch feeds regularly: a July 2026 snapshot is evidence of publication, not a permanent firewall list.

Control it with robots.txt

Microsoft documents crawler controls for this bot family. Robots.txt can direct cooperative crawling, but it cannot prove that a request is authentic.

Allow Bingbot
User-agent: bingbot
Allow: /
Block Bingbot
User-agent: bingbot
Disallow: /

Read Microsoft's official crawler documentation ↗

Track it

Aiola tracks this crawler on your site — crawls, pages, trends. See when Bingbot arrives, which URLs it requests, and how activity changes over time.

Explore Aiola Analytics

FAQ

What is Bingbot?

Bingbot crawls and renders pages for the Bing index, which also supplies results to Microsoft Copilot. Aiola classifies it as indexing because it supports a searchable retrieval index.

What user-agent token identifies Bingbot?

Match the case-insensitive token “Bingbot” in the User-Agent header. A matching header alone does not authenticate the sender.

Can I verify Bingbot by IP address?

Microsoft publishes a JSON feed, and this page snapshots 28 CIDR prefixes fetched on 2026-07-11. Match the source IP against the current vendor feed before trusting it.

Can robots.txt block Bingbot?

Microsoft documents crawler controls for this bot family. Robots.txt can direct cooperative crawling, but it cannot prove that a request is authentic. Use the specific “bingbot” group when you want a rule for this identity without changing rules for every crawler.

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