AS19551 is an autonomous system operated by Imperva (Incapsula). Type: CDN / edge network.
Names identify network operators so that lookups can be read. They do not imply partnership or endorsement, and nothing here ranks one network against another.
Facts
AS number
AS19551
Operator
Imperva (Incapsula)
Registered holder
Incapsula Inc
Network type
CDN / edge network
The number-to-holder mapping was read from the Team Cymru IP-to-ASN service, which mirrors the regional internet registries, on 2026-09-21. The type is our own classification.
Live registry data
Read by our server at the time shown. Nothing in this box is stored in the directory.
Registered name
INCAPSULA - Incapsula Inc
Country of registration
United States (US)
Regional registry
ARIN
Allocated on
Jan 12, 2011
LiveSource: Team Cymru IP-to-ASN (DNS)Observed:
The country shown for an AS number or an IP prefix is where it is registered, not where a server stands. Large networks announce the same addresses from many countries.
About Imperva (Incapsula)
The network of Imperva’s cloud web application firewall and DDoS protection service, registered under its earlier name Incapsula.
What it means when a site’s IP address is in this network
Imperva (Incapsula) is an edge network: the address you see belongs to a proxy that answers on behalf of the site. The origin server sits somewhere else and is not visible from outside, so the address says nothing about where the site is really hosted, in which country, or with which hosting company. Many unrelated sites share the same addresses. The TLS certificate and some response headers may also come from the edge.
Check which network a domain is in
The IP lookup resolves a domain, then shows the AS number, prefix and network name of each address. Addresses in AS19551 link back to this page.
FAQ
Who owns AS19551?
AS19551 is registered to Imperva (Incapsula). The live box on this page shows the name, registry and allocation date as the registry data gives them at the moment of the lookup.
A website’s IP address is in AS19551. Is the site hosted by Imperva (Incapsula)?
Not necessarily. Imperva (Incapsula) is an edge network, so the address belongs to a proxy in front of the site. The origin server can be with any hosting company and is not visible from outside.
How do I find the AS number of a domain?
Resolve the domain to its A and AAAA records and look up each address. OrbitProbe’s IP lookup does both and shows the AS number, the announced prefix and the network name for every address.
Does the country of an AS number show where the server is?
No. It is the country in which the number is registered. Networks announce addresses from many locations, and anycast networks answer from whichever site is closest to the visitor.
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