# 104.21.43.133 — IP Intelligence Summary

104.21.43.133 is an IPv4 address operated by Cloudflare, Inc. (AS13335), geolocated to United States. It belongs to datacenter or hosting infrastructure. As of November 2, 2026, IPDebrief rates it Low Risk (30/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/104.21.43.133
- Last updated: 2026-11-02

## Ownership

- Organization: Cloudflare, Inc.
- Network name: CLOUDFLARENET
- Allocated block: 104.16.0.0/12
- ASN: AS13335 (https://ipdebrief.com/asn/13335)
- Regional registry: ARIN
- Cloud / hosting provider: Cloudflare

## Location

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

## Network classification

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

## Risk assessment

- Assessment: Low Risk (30/100)
- Blocklist listings: 0
- Suspicious activity indicators: no
- Spam source: no

## Exposed services

- 80/tcp — http
- 443/tcp — https
- 8080/tcp — http-alt
- 8443/tcp — https-alt

## Analyst narrative

IP 104.21.43.133 was identified as an endpoint belonging to Cloudflare, Inc. (ASN 13335) and operated as a Content Delivery Network. The address presented a low-risk profile with a score of 30, though a moderate severity recommendation was issued for rate-limiting actions. Network scans revealed open TCP ports 80, 443, 8080, and 8443, with a server banner identifying the service as Cloudflare. No specific threat indicators, known attack campaigns, or attacker classifications were associated with the address. Control plane data indicated one DNS blacklist listing among eight total lists. The local subnet (104.21.43.0/24) was classified as clean with zero abuse density and no threat siblings. Defensive measures suggested included rate limiting traffic at a maximum rate of five requests per minute.

## Nearby addresses

- 104.21.43.88 (https://ipdebrief.com/104.21.43.88)
- 104.21.43.186 (https://ipdebrief.com/104.21.43.186)

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Source: IPDebrief, "104.21.43.133 IP intelligence", https://ipdebrief.com/104.21.43.133, updated 2026-11-02. Assessments are probabilistic.