AS27321
Internet Systems Consortium, Inc.
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Multiple-origin (MOAS) routing anomaly −12
- Isp allocation +5
- Trust score 58 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
About Internet Systems Consortium
Internet Systems Consortium, Inc., also known as ISC, is an American non-profit corporation that supports the infrastructure of the universal, self-organizing Internet by developing and maintaining core production-quality software, protocols, and operations. ISC has developed several key Internet technologies that enable the global Internet, including: BIND, ISC DHCP and Kea.
⚠ 1 MOAS prefix — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS27321 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 149.20.0.0/24 | AS1280, AS27321 | 2026-07-23 10:23:28 |
Network profile
Source: PeeringDB →Present at 3 internet exchanges: SFMIX, FCIX, ARIX: Primary
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 149.20.2.0/23 | 512 |
26.2%
|
Internet Systems Consortium, Inc. | US | — | — |
| 192.158.248.0/23 | 512 |
6.1%
|
Internet Systems Consortium, Inc. | US | — | — |
| 149.20.4.0/24 | 256 |
50.0%
|
Internet Systems Consortium, Inc. | US | — | — |
| 149.20.57.0/24 | 256 |
4.7%
|
Internet Systems Consortium, Inc. | US | — | — |
| 149.20.66.0/24 | 256 |
0.0%
|
Internet Systems Consortium, Inc. | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS27321 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 149.20.66.0/24 | 8,235 | 2026-07-24 20:47:28 |
| 149.20.57.0/24 | 8,183 | 2026-07-24 20:47:28 |
| 192.158.248.0/24 | 8,162 | 2026-07-24 20:47:28 |
| 192.158.249.0/24 | 8,145 | 2026-07-24 20:47:28 |
| 149.20.2.0/24 | 8,126 | 2026-07-24 20:47:28 |
| 149.20.3.0/24 | 8,124 | 2026-07-24 20:47:28 |
| 149.20.4.0/24 | 8,113 | 2026-07-24 20:47:28 |
| 149.20.0.0/24 | 1,625 | 2026-07-24 20:47:28 |
Frequently Asked Questions
What is AS27321?
AS27321 is an Autonomous System Number assigned to Internet Systems Consortium, Inc.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS27321 announce?
AS27321 announces 1.8K IPv4 addresses distributed across 5 routed CIDR prefixes. The network is registered in United States.
Who operates AS27321?
AS27321 is operated by Internet Systems Consortium, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS27321 registered in?
AS27321 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
