Autonomous system
AS15391 SYSCL1
Hosting RIPE
Summary
Sysclay
hosting isp infrastructure
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
/29prefixes 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Equinix Internet Exchange Warsaw | Warsaw, Poland | 195.182.218.152 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 6.14K addresses IPv6 5 prefixes
| Country | Name | Prefixes |
|---|---|---|
| PL | Poland | 12 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS15391- Registry name
- SYSCL1
- Registrant
- Sysclay Sp. z o. o.
- Abuse contact
- abuse@sysclay.net
- Registered
- 2015-09-15
- Last changed
- 2022-11-18
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 12 with no ROA
- ROAs
- 0 authorising AS15391
- ASPA
- no ASPA record
- IRR
- 100% registered · 12 of 12 announcements
- Route objects
- 37 naming AS15391
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,773 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere