# 216.73.163.4 — IP Intelligence Summary

216.73.163.4 is an IPv4 address operated by Prefixx, Inc. (AS206092), geolocated to San Francisco, United States. As of September 2, 2026, IPDebrief rates it Low Risk (25/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/216.73.163.4
- Last updated: 2026-09-02

## Ownership

- Organization: Prefixx, Inc.
- Network name: PFX-EXPRESSVPN
- Allocated block: 216.73.160.0/22
- ASN: AS206092 (https://ipdebrief.com/asn/206092)
- Regional registry: ARIN

## Location

- City: San Francisco
- Region: CA
- Country: United States
- Time zone: America/Los_Angeles

## Network classification

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

## Risk assessment

- Assessment: Low Risk (25/100)
- Blocklist listings: 0
- Suspicious activity indicators: no
- Spam source: no

## Analyst narrative

\# IP Intelligence Briefing: 216.73.163.4/32

**Classification:** Low Risk | **Risk Score:** 25 | **Report Date:** 2026-07-28

\## Executive Summary

IP 216.73.163.4 is a low-risk endpoint belonging to Prefixx, Inc. (ASN 206092) within the PFX-EXPRESSVPN network block. The IP exhibits no active threat indicators, no open services, and minimal DNSBL presence. Network classification indicates firewall protection with no exposed services.

\## Ownership & Infrastructure

\- **Organization:** Prefixx, Inc.

\- **Network:** PFX-EXPRESSVPN

\- **CIDR Block:** 216.73.160.0/22

\- **ASN:** 206092

\- **Geolocation:** United States, California, San Francisco

\- **Network Role:** Firewall / No Services

\## Threat Assessment

\- **Overall Risk:** Low (Score: 25/100)

\- **Abuse Confidence:** None detected

\- **Blacklist Status:** 1 of 8 DNSBL listings

\- **Tor Exit Node:** No

\- **Known Attacker:** No

\- **Spam Source:** No

\- **Campaign Association:** None identified

\- **Persistent Threat Status:** No

\## Network Behavior

\- **Open Ports:** None detected

\- **DNS Resolution:** Forward resolution not confirmed

\- **Hosted Domains:** None

\- **Email Authentication:** SPF/DMARC not configured

\- **TLS Certificates:** None

\- **HTTP Banner:** None

\- **Connection Type:** Not a proxy, CDN, cloud, or hosting service

\## Control Plane Analysis

\- **Route Stability:** False (route changes observed)

\- **Operator Score:** 0.1304 (Minimal)

\- **RPKI State:** Not verified

\- **DNSSEC:** Valid

\- **Bogon Status:** Not bogon

\## Neighborhood Analysis (216.73.163.0/24)

\- **Total Siblings:** 82 IPs

\- **Active Siblings:** 37

\- **Threat Siblings:** 2

\- **Abuse Density:** 0.0244

\- **Subnet Classification:** Clean

\- **Risk Distribution:** 80 low, 1 medium, 0 high

\- **Elevated Risk Neighbor:** 216.73.163.2 (Risk Score: 60)

\## Observation History

Sixteen signal observations recorded between 2026-07-28. Historical trend analysis shows:

\- No ownership changes

\- No persistent malicious activity

\- No threat observations over time

\- Consistent "clean" network classification

\- Stable service state (no open ports across observations)

\## Relationships

All relationship graph entries indicate association with the PFX-EXPRESSVPN network. No external organization, hostname, or certificate relationships identified.

\## Recommended Actions

Based on current risk profile, standard monitoring is appropriate. The IP presents minimal threat characteristics. No immediate blocking or filtering required.

**Note:** One neighboring IP (216.73.163.2) shows elevated risk (60) and should be monitored separately.

\---

*Intel produced by IPDebrief Platform | Authorized Defensive Security Analysis*

## Nearby addresses

- 216.73.163.2 (https://ipdebrief.com/216.73.163.2)
- 216.73.163.6 (https://ipdebrief.com/216.73.163.6)
- 216.73.163.7 (https://ipdebrief.com/216.73.163.7)
- 216.73.163.10 (https://ipdebrief.com/216.73.163.10)
- 216.73.163.11 (https://ipdebrief.com/216.73.163.11)
- 216.73.163.12 (https://ipdebrief.com/216.73.163.12)
- 216.73.163.13 (https://ipdebrief.com/216.73.163.13)
- 216.73.163.16 (https://ipdebrief.com/216.73.163.16)
- 216.73.163.20 (https://ipdebrief.com/216.73.163.20)
- 216.73.163.22 (https://ipdebrief.com/216.73.163.22)
- 216.73.163.24 (https://ipdebrief.com/216.73.163.24)
- 216.73.163.27 (https://ipdebrief.com/216.73.163.27)

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Source: IPDebrief, "216.73.163.4 IP intelligence", https://ipdebrief.com/216.73.163.4, updated 2026-09-02. Assessments are probabilistic.