Bot IP: 157.55.39.57

Name: Bot IP Lookup: 157.55.39.57 (Bingbot)
Creator: Track-A-Bot

Bot Name: Bingbot

Bingbot is the primary web crawler used by Microsoft Bing to discover and index web content for its search engine results.

Likely legitimate

Track-A-Bot Trust Score: 87/100

score

0255075100

Why Track-A-Bot rated this IP (tap to expand)

Identity

✅ Marked as bot traffic
✅ Bot name present
✅ User-agent matches bot name
✅ User-agent includes identity link/email

Hostname

✅ Hostname observed
ℹ️ Hostname does not resemble bot name
ℹ️ Hostname status not verified
✅ No hostname mismatch flags

Behavior

ℹ️ No /robots.txt request observed
✅ No referrer (typical crawler behavior)
✅ Mostly 200/304 responses
📌 Visits: 86
⏱️ Age: 14367h

Penalties

✅ No major spoof pattern
✅ No fingerprint fields
✅ Cookies not enabled
✅ No connection type

Total visits: 86 First seen: Apr 23rd, 2024 3:47 AM Last seen: Dec 12th, 2025 7:23 PM

Known Hostname(s)

msnbot-157-55-39-57.search.msn.com

Known User Agent(s)

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Edg/112.0.1722.68

Known Accepted Encoding(s)

gzip, deflate, br

Common User-Agent Tokens

These are identifiers found inside user-agent strings we observed for bingbot.

Token

Seen

First seen

Last seen

bingbot/2.0

40,280

3/17/24

12/12/25

bingbot/2.0 40,280 seen

First 3/17/24

Last 12/12/25

mobile/15e148

1/26/25

12/12/25

mobile/15e148 13 seen

First 1/26/25

Last 12/12/25

17_1

2/26/25

12/12/25

17_1 3 seen

First 2/26/25

Last 12/12/25

17_2

1/26/25

12/12/25

17_2 3 seen

First 1/26/25

Last 12/12/25

microsoftpreview/2.0

12/12/25

microsoftpreview/2.0 3 seen

First 12/12/25

Last 12/12/25

unknown

12/12/25

unknown 3 seen

First 12/12/25

Last 12/12/25

10_15_7

5/7/25

12/12/25

10_15_7 2 seen

First 5/7/25

Last 12/12/25

17_0

4/10/25

17_0 2 seen

First 4/10/25

Last 4/10/25

17_3

12/12/25

17_3 2 seen

First 12/12/25

Last 12/12/25

18_1_1

4/29/25

5/2/25

18_1_1 2 seen

First 4/29/25

Last 5/2/25

adidxbot/2.0

10/21/25

10/22/25

adidxbot/2.0 2 seen

First 10/21/25

Last 10/22/25

crios/131.0.6778.73

4/29/25

crios/131.0.6778.73 2 seen

First 4/29/25

Last 4/29/25

gecko/20100101

2/18/25

12/12/25

gecko/20100101 2 seen

First 2/18/25

Last 12/12/25

unique/97.7.7286.70

1/27/25

12/12/25

unique/97.7.7286.70 2 seen

First 1/27/25

Last 12/12/25

17_5_1

4/28/25

17_5_1 1 seen

First 4/28/25

Last 4/28/25

avastsecurebrowser/5.3.1

12/12/25

avastsecurebrowser/5.3.1 1 seen

First 12/12/25

Last 12/12/25

build/mmb29p

12/11/25

build/mmb29p 1 seen

First 12/11/25

Last 12/11/25

crios/122.0.6261.62

12/12/25

crios/122.0.6261.62 1 seen

First 12/12/25

Last 12/12/25

edga/121.0.0.0

2/20/25

edga/121.0.0.0 1 seen

First 2/20/25

Last 2/20/25

edgios/116.0.1938.56

3/1/25

edgios/116.0.1938.56 1 seen

First 3/1/25

Last 3/1/25

edgios/116.0.1938.79

4/10/25

edgios/116.0.1938.79 1 seen

First 4/10/25

Last 4/10/25

edgios/118.0.2088.68

2/26/25

edgios/118.0.2088.68 1 seen

First 2/26/25

Last 2/26/25

edgios/119.0.2151.78

12/12/25

edgios/119.0.2151.78 1 seen

First 12/12/25

Last 12/12/25

edgios/120.0.2210.126

12/12/25

edgios/120.0.2210.126 1 seen

First 12/12/25

Last 12/12/25

edgios/120.0.2210.141

2/25/25

edgios/120.0.2210.141 1 seen

First 2/25/25

Last 2/25/25

edgios/120.0.2210.86

1/26/25

edgios/120.0.2210.86 1 seen

First 1/26/25

Last 1/26/25

edgios/121.0.2277.107

12/12/25

edgios/121.0.2277.107 1 seen

First 12/12/25

Last 12/12/25

trailer/93.3.3516.28

4/16/25

trailer/93.3.3516.28 1 seen

First 4/16/25

Last 4/16/25

viewer/99.9.9009.89

12/12/25

viewer/99.9.9009.89 1 seen

First 12/12/25

Last 12/12/25

Identity Links

These are URLs we observed in association with bingbot (often used as an identity, help, or policy link).

URL

Seen

First seen

Last seen

www.bing.com/bingbot.htm

40,282

3/17/24

12/12/25

www.bing.com/bingbot.htm 40,282 seen www.bing.com

First 3/17/24

Last 12/12/25

aka.ms/MicrosoftPreview

12/12/25

aka.ms/MicrosoftPreview 3 seen aka.ms

First 12/12/25

Last 12/12/25

Bot FAQ for this IP

Why is bingbot visiting my website?

Bingbot is a web crawler operated by Microsoft to index content for the Bing search engine. Visits from the IP address 157.55.39.57, with the user agent string indicating 'bingbot/2.0', are typically part of Bing's automated process to discover and update web pages in its search results. The recent activity shows requests to various URLs and the sitemap, which is standard behavior for search engine bots. If your website is publicly accessible, bingbot may visit to keep Bing's search index up to date. To verify the legitimacy of these visits, consider checking the reverse DNS for the IP (should resolve to a Microsoft-owned domain), reviewing the user agent, and monitoring request patterns.

What does bingbot do?

Bingbot systematically crawls websites to collect and update information for Bing's search engine. It requests web pages, sitemaps, and other resources to analyze content, structure, and updates. This helps Bing provide accurate and current search results. Bingbot typically follows the rules set in a site's robots.txt file, which can be used to control or limit its access. Site owners can monitor bingbot's activity through server logs and adjust robots.txt directives if needed. For further verification, check the IP's reverse DNS and confirm it matches Microsoft's documented ranges.

Is bingbot safe?

Bingbot is generally considered safe and is a legitimate crawler used by Microsoft for search indexing. The IP address 157.55.39.57 resolves to a Microsoft-owned domain, and the user agent matches the official bingbot format. However, it is always recommended to verify bot traffic to prevent impersonation. Steps include: 1) Perform a reverse DNS lookup to confirm the IP resolves to a Microsoft domain; 2) Check that the user agent matches official documentation; 3) Use allow/block lists or robots.txt to manage access; 4) Monitor for unusual request rates; 5) Apply rate limiting or WAF rules if excessive crawling is detected. If bingbot activity is causing issues, adjust robots.txt or server settings accordingly.

This page provides a detailed lookup for the bot with the IP address of 157.55.39.57, based on real-world traffic observed across websites using Track-A-Bot software. Use this information to verify whether activity from this IP belongs to a legitimate search engine crawler, or to analyze bot behavior on your website.