# 154.12.6.91 — IP Intelligence Summary

154.12.6.91 is an IPv4 address operated by ENDOFFICE - Charles River Operation, US (AS64249), with approximate network location Waltham, United States. As of November 13, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/154.12.6.91
- Last updated: 2026-11-13

## Ownership

- Organization: Cogent Communications, LLC
- Network name: COGENT-154-12-16
- Allocated block: 154.12.0.0/16
- ASN: AS64249 (https://ipdebrief.com/asn/64249)
- Regional registry: AFRINIC
- Registered holder: Cogent Communications, LLC
- Routing operator: ENDOFFICE - Charles River Operation, US
- Network registration country: United States
- Registrant address country: —

## Location

- City: Waltham
- Region: MA
- Country: United States
- Time zone: America/New_York

Approximate network location; registration and certificate addresses are not server-location evidence.

## Network classification

- Infrastructure type: —
- Datacenter / hosting: no
- Residential: no
- Mobile: no
- Anycast: Unverified (not proof of unicast)
- Tor exit node: no
- VPN: no
- Proxy: no

## Risk assessment

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

## DNS posture

Mail authentication and CAA are optional domain policies, not IP-wide requirements.

- caa: Not applicable (—)
- spf: Unknown / lookup inconclusive (—)
- dmarc: Unknown / lookup inconclusive (—)
- dnssec: Unknown / lookup inconclusive (91.6.12.154.in-addr.arpa)
- fcrDns: Unknown / lookup inconclusive

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Source: IPDebrief, "154.12.6.91 IP intelligence", https://ipdebrief.com/154.12.6.91, updated 2026-11-13. Assessments are probabilistic.