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
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
AS23237 — global IP footprint
Cities where AS23237 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 130.113.0.0/16 | 65.5K |
27.1%
|
McMaster University | CA | Ontario | Stoney Creek |
| 192.42.5.0/24 | 256 |
0.0%
|
McMaster University | CA | — | — |
| 192.42.6.0/24 | 256 |
0.0%
|
McMaster University | CA | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS23237 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 |
|---|---|---|
| 130.113.0.0/16 | 5,303 | 2026-07-18 12:01:03 |
| 192.42.6.0/24 | 5,248 | 2026-07-18 12:01:03 |
| 192.42.5.0/24 | 5,246 | 2026-07-18 12:01:03 |
| 130.113.109.0/24 | 5,124 | 2026-07-18 12:01:03 |
Frequently Asked Questions
What is AS23237?
AS23237 is an Autonomous System Number assigned to McMaster University. 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 AS23237 announce?
AS23237 announces 66.0K IPv4 addresses distributed across 3 routed CIDR prefixes. The network is registered in Canada.
Who operates AS23237?
AS23237 is operated by McMaster University. The organization is based in Canada. You can view all IP ranges and related ASNs on the organization page.
What country is AS23237 registered in?
AS23237 is registered in Canada. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
