AS13919 — ALLDATA-NET01

AS13919 announces 3 IPv4 prefixes covering 2,048 addresses and 0 IPv6 prefixes.

About this network

The netname writes out the parent allocation in full, so the record describes space the AS never announces.

What it's used for

• A data services company's network. 2,048 addresses across three IPv4 prefixes, six observed BGP neighbours, and no IPv6 announced.

Notable

• All three blocks carry netname NET-205-144-48-0-20, registered to ADS Alliance Data Systems, Inc.
• The announced prefixes are 205.144.50.0/23, 205.144.52.0/23 and 205.144.60.0/22, all inside the range that netname describes.
• Nine addresses were queried for reverse DNS and one returned a name, sdad3spam04.alldata.net.

Interesting

• The netname is the parent block written as an address and a prefix length with the punctuation swapped for hyphens. It means the whole allocation can be reconstructed from the name alone, and it also means the record describes four times the space that is actually routed.
• What sits between the announced pieces is held and unrouted. A company that takes a range this size and announces a third of it is keeping room to grow rather than returning what it has not used.
• The one hostname that answered names a mail filtering appliance, a site code and a two-digit index, which says there are at least three more of them that the sample never reached.

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

Announced prefixes

• 205.144.50.0/23
• 205.144.52.0/23
• 205.144.60.0/22

Upstream networks

• AS19551 Incapsula Inc
• AS399589 11 11 Systems, Inc
• AS3356 Level 3 Parent, LLC
• AS3257 GTT Communications Inc.
• AS701 Verizon Business

Adjacent networks

• AS19551 Incapsula Inc
• AS399589 11 11 Systems, Inc
• AS3356 Level 3 Parent, LLC
• AS3257 GTT Communications Inc.
• AS701 Verizon Business