AS12737 — RIGHTSIDE16

AS12737 announces 12 IPv4 prefixes covering 12,288 addresses and 0 IPv6 prefixes.

About this network

A reverse zone with the wrong octet baked in: addresses in .245 and .246 all answer as .244.

What it's used for

• Hosting and access in Russia. 12,288 addresses in thirteen IPv4 prefixes, nine observed BGP neighbours, and no IPv6 announced.

Notable

• Seventeen of eighteen sampled addresses answered, all under rightside.ru with the octets reversed.
• Three of them are wrong: 185.82.245.0, 185.82.245.255 and 185.82.246.254 answer as 0.244.82.185, 255.244.82.185 and 254.244.82.185.
• Blocks are registered to three related holders: KrasPromStroy LLC, Maxima LLC and KPS LLC.
• Netnames pair up by date: RU-KRASPROMSTROY-20180220 and RU-MAXIMAN-20180220 were filed the same day.
• First observed in the routing archive in October 2015.

Interesting

• Those three names are a generated zone with a constant where a variable should be. The template that produced them substituted the last octet correctly and hardcoded the third at 244, the first block in the /22, so every address across four /24s claims to live in the first one. Nothing breaks, because almost nothing checks that a reverse name resolves back to the address it came from.
• Two holders filing allocations on the same day, twice, is one operation with more than one legal entity. The registry records the entities; the reverse DNS records the operation, and here it puts all of them under a single domain that matches neither company name.
• October 2015 is a genuine first appearance rather than the floor of the archive, so this network started announcing then, on an AS number issued long before.

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

Announced prefixes

• 5.189.192.0/21
• 5.189.240.0/21
• 45.15.112.0/22
• 84.54.5.0/24
• 185.82.196.0/22
• 185.82.244.0/22
• 185.91.176.0/22
• 185.124.152.0/22
• 185.124.228.0/22
• 185.126.128.0/23
• 185.126.130.0/24
• 217.144.172.0/22

Upstream networks

• AS12389 PJSC Rostelecom
• AS31133 PJSC MegaFon
• AS3216 PJSC "Vimpelcom"
• AS8359 MTS PJSC

Downstream networks

• AS50439 City Telephone Network Ltd.
• AS208912 KrasPromStroy, LLC
• AS205720 LLC Maltat

Adjacent networks

• AS12389 PJSC Rostelecom
• AS31133 PJSC MegaFon
• AS210267 Maxima, LLC
• AS3216 PJSC "Vimpelcom"
• AS8359 MTS PJSC
• AS50439 City Telephone Network Ltd.
• AS208912 KrasPromStroy, LLC
• AS205720 LLC Maltat

Internet exchanges

• GNM Internet Exchange Amsterdam — Amsterdam, Netherlands