# 151.101.193.91 — IP Intelligence Summary

151.101.193.91 is an IPv4 address operated by Fastly, Inc. (AS54113), geolocated to United States. As of October 30, 2026, IPDebrief rates it High Risk (70/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/151.101.193.91
- Last updated: 2026-10-30

## Ownership

- Organization: Fastly, Inc.
- Network name: SKYCA-3
- Allocated block: 151.101.0.0/16
- ASN: AS54113 (https://ipdebrief.com/asn/54113)
- Regional registry: RIPE
- Cloud / hosting provider: Fastly

## Location

- City: —
- Region: —
- Country: United States
- Time zone: —

## Network classification

- Infrastructure type: —
- Datacenter / hosting: no
- Residential: no
- Mobile: no
- Anycast: no
- Tor exit node: no
- VPN: no
- Proxy: no

## Risk assessment

- Assessment: High Risk (70/100)
- Blocklist listings: 0
- Suspicious activity indicators: no
- Spam source: no

## Exposed services

- 80/tcp — http
- 443/tcp — https

## Analyst narrative

Intelligence analysis identified IP 151.101.193.91 as associated with Fastly, Inc. (ASN 54113) within the SKYCA-3 network block. Although the infrastructure type is classified as a CDN, threat intelligence categorized this endpoint as campaign infrastructure with a high likelihood of involvement in coordinated attacks. The address received a High Risk reputation score of 70.

Service enumeration confirmed active HTTP and HTTPS listeners on ports 80 and 443. HTTP requests returned a Varnish server banner, and TLS certificates were issued by GlobalSign for the subject n.sni-347-default.ssl.fastly.net. Geolocation data indicated the United States, but physical validation contradicted this finding; a measured RTT of 15ms conflicted with the claimed distance of 7625km, which requires a minimum of 152.5ms. The IP was listed on one DNS blacklist.

The surrounding neighborhood (151.101.193.0/24) showed a mixed classification with an abuse density of 0.5238, including 11 identified threat siblings. Due to the high risk score and strong threat evidence, the assessment concluded a critical severity recommendation to block the address.

## Nearby addresses

- 151.101.193.16 (https://ipdebrief.com/151.101.193.16)
- 151.101.193.21 (https://ipdebrief.com/151.101.193.21)
- 151.101.193.32 (https://ipdebrief.com/151.101.193.32)
- 151.101.193.40 (https://ipdebrief.com/151.101.193.40)
- 151.101.193.42 (https://ipdebrief.com/151.101.193.42)
- 151.101.193.44 (https://ipdebrief.com/151.101.193.44)
- 151.101.193.55 (https://ipdebrief.com/151.101.193.55)
- 151.101.193.87 (https://ipdebrief.com/151.101.193.87)
- 151.101.193.111 (https://ipdebrief.com/151.101.193.111)
- 151.101.193.132 (https://ipdebrief.com/151.101.193.132)
- 151.101.193.135 (https://ipdebrief.com/151.101.193.135)
- 151.101.193.140 (https://ipdebrief.com/151.101.193.140)

## Addresses sharing infrastructure

- 151.101.1.91 — Same TLS certificate (https://ipdebrief.com/151.101.1.91)
- 151.101.33.91 — Same TLS certificate (https://ipdebrief.com/151.101.33.91)
- 151.101.65.91 — Same TLS certificate (https://ipdebrief.com/151.101.65.91)
- 151.101.129.91 — Same TLS certificate (https://ipdebrief.com/151.101.129.91)
- 199.232.193.91 — Same TLS certificate (https://ipdebrief.com/199.232.193.91)
- 199.232.197.91 — Same TLS certificate (https://ipdebrief.com/199.232.197.91)
- 213.232.204.130 — Same TLS certificate (https://ipdebrief.com/213.232.204.130)

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Source: IPDebrief, "151.101.193.91 IP intelligence", https://ipdebrief.com/151.101.193.91, updated 2026-10-30. Assessments are probabilistic.