Next to your IP address, the Show-IP.ir result shows a field called ASN plus a company name — say "Mobile Communication Company of Iran" or "Cloudflare". This article explains what an ASN is and why it matters for figuring out who really owns an IP address.
What does ASN mean?
An Autonomous System Number (ASN) is a numeric ID assigned to each "autonomous system" — a large network with its own independent routing policy, such as an ISP, a datacenter, or a large company. The internet is built from thousands of interconnected autonomous systems, and the BGP protocol decides how traffic routes between them.
How is ASN different from an IP address?
An IP address belongs to a single device or a small range, while an ASN identifies who owns the much larger block of IP ranges that address sits in. For example, thousands of different Mobile Communication Company of Iran (Hamrah-e Avval) addresses all sit under one fixed ASN. Because of that, ASN is usually more stable and reliable than the displayed city or even the ISP name.
What is ASN actually used for?
- Identifying the real network operator: when the ISP name is vague, the ASN says exactly which company the IP belongs to.
- Detecting datacenters/VPNs: most VPN and cloud services (AWS, Google Cloud, DigitalOcean...) run on well-known ASNs — sites use this to flag non-residential traffic, which is exactly what the "security status" section on this site reports as
is_datacenter. - Smarter blocking: instead of blocking individual IPs one by one, some services throttle an entire suspicious ASN.
- Network troubleshooting: network admins use ASN to trace how traffic routes between two providers.
A few well-known ASNs
- Iranian carriers: Hamrah-e Avval, Irancell, TCI (Mokhaberat), Shatel — each owns its own IP ranges and ASN.
- International cloud/CDN ASNs: Cloudflare, Google, Amazon AWS, Microsoft Azure — if your IP sits under one of these, you're most likely behind a VPN or proxy, not a home connection.
How do I see my own ASN?
Just open the Show-IP.ir home page — the "Network Information" section shows the ASN number, organization name and domain tied to your current IP, no extra tools needed.
Key takeaways
- An ASN identifies the network that manages a whole range of IPs, not a single device.
- It's more stable than city/geographic data and more reliable for identifying the real operator.
- Datacenter/cloud ASNs are a common signal of VPN or proxy use.
- You can see it right on Show-IP.ir without any extra tools.