AS15027 — FH-ASN-15027

AS15027 announces 3 IPv4 prefixes covering 768 addresses and 0 IPv6 prefixes.

About this network

Two blocks the firm owns, answering under two carriers' domains.

What it's used for

• A law firm's network. Three IPv4 /24 blocks announced from the United States, no IPv6, and two observed BGP neighbours.

Notable

• Two blocks are registered to the firm, under the netnames MB367410-LAN and NET-144-121-27-0-24. The third carries the carrier netname COGENT-A.
• Both of the firm's own blocks publish reverse names under a carrier's domain rather than the firm's: one answers host-64-47-15-64.masergy.com and the other 144.121.27.64.lightower.net.
• Those two carriers are different from each other and from the one holding the third block.
• The AS handle is FH-ASN-15027, which embeds the AS number inside the AS handle.
• Six of nine sampled addresses returned a name.

Interesting

• Owning the address space and letting the carrier own the reverse zone is a common split and a quietly consequential one. The registry says the firm holds these blocks; the DNS says a carrier operates them, and anything reading names rather than registrations will attribute the traffic to the wrong organisation.
• Three blocks, three different carriers touching them, is more supplier churn than a network this size usually shows. Each one left its mark in a different field.
• One netname is an account number with a network type appended; the other is the address written out. Neither says anything about the firm, so the registrant field is the only place the holder appears.

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

Announced prefixes

• 38.111.59.0/24
• 64.47.15.0/24
• 144.121.27.0/24

Upstream networks

• AS19855 Masergy Communications, Inc.
• AS174 Cogent Communications, LLC

Adjacent networks

• AS19855 Masergy Communications, Inc.
• AS174 Cogent Communications, LLC