# 191.37.138.4 — IP Intelligence Summary

191.37.138.4 is an IPv4 address operated by AS263360 - BR MASTER PROVEDOR DE INTERNET LTDA, BR (AS263360), with approximate network location Campina das Missões, Brazil. Its reverse DNS name is 191-37-138-4.brmaster.com.br. As of November 13, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/191.37.138.4
- Last updated: 2026-11-13

## Ownership

- Organization: BR MASTER PROVEDOR DE INTERNET LTDA
- Network name: 225091
- Allocated block: 191.37.136.0/22
- ASN: AS263360 (https://ipdebrief.com/asn/263360)
- Regional registry: LACNIC
- Registered holder: BR MASTER PROVEDOR DE INTERNET LTDA
- Routing operator: AS263360 - BR MASTER PROVEDOR DE INTERNET LTDA, BR
- Network registration country: BR
- Registrant address country: —

## Location

- City: Campina das Missões
- Region: Rio Grande do Sul
- Country: Brazil
- Time zone: —

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

## Reverse DNS

- 191-37-138-4.brmaster.com.br
- Forward-confirmed: no

## DNS posture

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

- caa: Not found at queried name (br)
- spf: Unknown / lookup inconclusive (191-37-138-4.brmaster.com.br)
- dmarc: Unknown / lookup inconclusive (_dmarc.191-37-138-4.brmaster.com.br)
- dnssec: Unknown / lookup inconclusive (4.138.37.191.in-addr.arpa)
- fcrDns: Unknown / lookup inconclusive (191-37-138-4.brmaster.com.br)

## Nearby addresses

- 191.37.138.56 (https://ipdebrief.com/191.37.138.56)

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Source: IPDebrief, "191.37.138.4 IP intelligence", https://ipdebrief.com/191.37.138.4, updated 2026-11-13. Assessments are probabilistic.