AS21730
Halstad Telephone Company
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
- Isp allocation +5
- Trust score 70 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
AS21730 — global IP footprint
Cities where AS21730 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 |
|---|---|---|---|---|---|---|
| 65.61.64.0/19 | 8.2K |
91.8%
|
Halstad Telephone Company | US | Minnesota | Fisher |
| 199.199.224.0/21 | 2.0K |
55.4%
|
Halstad Telephone Company | US | Minnesota | Halstad |
| 204.73.192.0/21 | 2.0K |
80.2%
|
Halstad Telephone Company | US | Minnesota | Climax |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21730 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 |
|---|---|---|
| 65.61.69.0/24 | 8,611 | 2026-07-18 10:52:07 |
| 65.61.70.0/24 | 8,610 | 2026-07-18 10:52:07 |
| 65.61.71.0/24 | 8,608 | 2026-07-18 10:52:07 |
| 65.61.93.0/24 | 8,605 | 2026-07-18 10:52:07 |
| 65.61.68.0/24 | 8,605 | 2026-07-18 10:52:07 |
| 65.61.72.0/24 | 8,604 | 2026-07-18 10:52:07 |
| 65.61.87.0/24 | 8,600 | 2026-07-18 10:52:07 |
| 65.61.73.0/24 | 8,599 | 2026-07-18 10:52:07 |
| 65.61.90.0/24 | 8,598 | 2026-07-18 10:52:07 |
| 65.61.86.0/24 | 8,597 | 2026-07-18 10:52:07 |
| 65.61.66.0/24 | 8,594 | 2026-07-18 10:52:07 |
| 65.61.88.0/24 | 8,594 | 2026-07-18 10:52:07 |
| 65.61.65.0/24 | 8,591 | 2026-07-18 10:52:07 |
| 65.61.92.0/24 | 8,591 | 2026-07-18 10:52:07 |
| 65.61.64.0/24 | 8,590 | 2026-07-18 10:52:07 |
| 65.61.94.0/24 | 8,589 | 2026-07-18 10:52:07 |
| 65.61.95.0/24 | 8,589 | 2026-07-18 10:52:07 |
| 65.61.82.0/24 | 8,586 | 2026-07-18 10:52:07 |
| 65.61.67.0/24 | 8,583 | 2026-07-18 10:52:07 |
| 65.61.81.0/24 | 8,583 | 2026-07-18 10:52:07 |
| 65.61.91.0/24 | 8,581 | 2026-07-18 10:52:07 |
| 65.61.84.0/24 | 8,574 | 2026-07-18 10:52:07 |
| 65.61.89.0/24 | 8,572 | 2026-07-18 10:52:07 |
| 65.61.83.0/24 | 8,572 | 2026-07-18 10:52:07 |
| 65.61.80.0/24 | 8,570 | 2026-07-18 10:52:07 |
| 65.61.78.0/24 | 8,569 | 2026-07-18 10:52:07 |
| 65.61.75.0/24 | 8,567 | 2026-07-18 10:52:07 |
| 65.61.77.0/24 | 8,565 | 2026-07-18 10:52:07 |
| 65.61.85.0/24 | 8,559 | 2026-07-18 10:52:07 |
| 65.61.74.0/24 | 8,547 | 2026-07-18 10:52:07 |
| 65.61.64.0/19 | 7,798 | 2026-07-18 10:52:07 |
| 199.199.224.0/21 | 7,653 | 2026-07-18 10:52:37 |
| 204.73.192.0/21 | 7,634 | 2026-07-18 10:52:37 |
Frequently Asked Questions
What is AS21730?
AS21730 is an Autonomous System Number assigned to Halstad Telephone Company. 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 AS21730 announce?
AS21730 announces 12.3K IPv4 addresses distributed across 3 routed CIDR prefixes. The network is registered in United States.
Who operates AS21730?
AS21730 is operated by Halstad Telephone Company. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS21730 registered in?
AS21730 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
