AS173
Nippon Telegraph and Telephone Corporation
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 v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 1 internet exchange: JPNAP Tokyo: Peering
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 163.138.160.0/19 | 8.2K |
0.0%
|
Nippon Telegraph and Telephone Corporation | JP | — | — |
| 192.47.168.0/23 | 512 |
14.1%
|
Nippon Telegraph and Telephone Corporation | JP | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS173 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 |
|---|---|---|
| 163.138.160.0/19 | 5,528 | 2026-07-31 04:34:29 |
| 192.47.168.0/23 | 5,500 | 2026-07-31 04:34:29 |
Frequently Asked Questions
What is AS173?
AS173 is an Autonomous System Number assigned to Nippon Telegraph and Telephone Corporation. 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 AS173 announce?
AS173 announces 8.7K IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in Japan.
Who operates AS173?
AS173 is operated by Nippon Telegraph and Telephone Corporation. The organization is based in Japan. You can view all IP ranges and related ASNs on the organization page.
What country is AS173 registered in?
AS173 is registered in Japan. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
