AS15391 — SYSCL1

Network type: hosting

AS15391 announces 7 IPv4 prefixes covering 6,144 addresses and 5 IPv6 prefixes.

About this network

Five separate IPv6 allocations against seven small IPv4 blocks.

What it's used for

• A hosting and connectivity provider. Seven IPv4 prefixes and five IPv6 /29 prefixes announced from Poland, six thousand addresses of IPv4, through three observed BGP neighbours.

Notable

• Each of those five IPv6 prefixes is a full allocation of the size a registry issues to a member, and holding five of them is far more than one organisation is normally given.
• The IPv4 blocks come from six unrelated parts of the address space, none adjacent to another.
• Netnames follow one pattern of country code, company and date, and the dates run from an early one to a cluster filed within weeks of each other. Two blocks share a single date.
• All twelve answering addresses use the same form: the address with dashes, the word static, and the company domain.
• Eighteen addresses were queried for reverse DNS and twelve returned a name.

Interesting

• Scattered small IPv4 blocks with recent registration dates are the signature of a network built by buying address space on the transfer market rather than being allocated it.
• Five IPv6 allocations alongside that is the same story in the other direction, and it is the more interesting half: whoever assembled this was collecting registry memberships.
• Labelling every address static is a promise to customers that the address will not change, which is what hosting and business connectivity are sold on.

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

Announced prefixes

• 45.145.208.0/22
• 45.146.44.0/22
• 45.155.0.0/22
• 185.122.136.0/22
• 185.242.32.0/22
• 193.22.240.0/23
• 193.22.246.0/23
• 2a05:d8c0::/29
• 2a06:83c0::/29
• 2a0e:e1c0::/29
• 2a0f:a080::/29
• 2a0f:a900::/29

Upstream networks

• AS12912 T-Mobile Polska S.A.
• AS31242 P4 Sp. z o.o.

Adjacent networks

• AS12912 T-Mobile Polska S.A.
• AS31242 P4 Sp. z o.o.

Internet exchanges

• Equinix Internet Exchange Warsaw — Warsaw, Poland