$ query “AS397027” --type=asn → 1 result(s)
AS397027 · BLOCK-LINE-DENVER
Block Line Systems LLC
AS397027 is owned by Block Line Systems LLC and is a residential access provider, based in the United States since 2018. The system announces 2 048 IPv4 addresses. The bulk of its IP address space is in the United States. No IPv6 support — it's 2026, just saying.
Basic Information
- Country
- 🇺🇸 United States
- Category
- Internet Service Provider
- Network Role
- Access Provider
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- August 31, 2018
- Last Changed
- May 01, 2026
- Last Seen
- May 11, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 9 / 1
- IPv6 Prefixes (raw / aggregated)
- 0 / 0
- IPv4 Addresses
- 2 048
- Largest IPv4 Prefix
- /21 (2 048 addresses)
- Geolocated Countries
- 🇺🇸 United States (2 048 IPs)
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs
Connectivity Summary
- Upstream Providers
- 3 upstreams providing transit
- Downstream Customers
- 1 downstream buying transit
- Degree
- 4 unique BGP neighbors
- Reach
- 1 network in customer cone
Upstream Providers (3)
Prefix Lists
IPv4 Prefixes (9 total)
- 24.53.152.0/21 (2 048 addresses (/21 prefix))