AS15173 — NEWMA-11

AS15173 announces 2 IPv4 prefixes covering 65,792 addresses and 0 IPv6 prefixes.

About this network

One registrant field holds two company names joined by a slash.

What it's used for

• A chemical company's network. Two IPv4 prefixes announced from the United States, no IPv6, and two observed BGP neighbours.

Notable

• The larger block is a /16 whose netname and registrant both name a predecessor company, not the holder announcing it.
• The smaller block is registered to a field that joins the holder and that predecessor with a slash, putting two company names in one value where a parser expects one.
• That smaller block also carries the UU- netname prefix of a carrier that no longer exists under that name, followed by the first three octets of the block.
• Six addresses were queried for reverse DNS and none returned a name.
• Sixty-five thousand addresses sit behind two upstreams, almost all of them in the single /16.

Interesting

• A slash-joined registrant is a human writing a note into a machine field. It says the block belongs to both entities, which is true and which no software can act on. Split it on the slash and you get two organisations that were only ever one.
• A whole /16 announced by a manufacturer is a survival from when large allocations were routine. It is worth far more today than it was when it was assigned, and the predecessor's name on it is the reason the record still shows the merger.
• Both a retired carrier's netname prefix and a retired company's name persist here. The registry preserves history it was never designed to preserve.

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

Announced prefixes

• 63.103.224.0/24
• 161.227.0.0/16

Upstream networks

• AS21508 Comcast Cable Communications, LLC
• AS701 Verizon Business

Adjacent networks

• AS21508 Comcast Cable Communications, LLC
• AS701 Verizon Business