AS19005 — MOZGROUP-SMTP - J2 Global Ventures, LLC

AS19005 announces 6 IPv4 prefixes covering 12,032 addresses and 0 IPv6 prefixes.

About this network

The AS handle MOZGROUP-SMTP is held by J2 Global Ventures, LLC.

What it's used for

• The address space carries SMTP infrastructure, as evidenced by reverse DNS entries such as mailer0.gate168.rs.smtp.com and mailer254.gate91.sl.smtp.com.
• The AS announces 12288 IPv4 addresses across 2 prefixes with 2 observed neighbours, indicating a specialized service network rather than a general transit or access provider.

Notable

• Both announced prefixes, 192.40.160.0/19 and 74.91.80.0/20, list J2 Global Ventures, LLC as the registrant, matching the AS holder.
• J2 Global, Inc. was an American technology holding company that provided Internet services before evolving into its current venture structure.
• The inventory consists of two distinct IPv4 blocks with no IPv6 prefixes, reflecting a legacy or specialized deployment focused on email delivery.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 74.91.80.0/20
• 192.40.160.0/22
• 192.40.164.0/23
• 192.40.166.0/24
• 192.40.168.0/21
• 192.40.176.0/20

Upstream networks

• AS577 Bell Canada
• AS15290 Zayo Bandwidth

Adjacent networks

• AS577 Bell Canada
• AS15290 Zayo Bandwidth

Routing security

• RPKI: 11 valid, 0 invalid and 0 not-found announcements; 11 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 11 route objects.