Washington University (AS2552) · 73,984 IPv4 addresses | Ipregistry

Products

IP Intelligence API IP Datasets

IP Intelligence API

Geolocation and threat intelligence for any IP address, from one fast and global API.
Explore the API

IP Datasets

The same data as downloadable CSV and MMDB files, rebuilt every day for offline use.
Browse the datasets
LIR Services

ASN Registration IPv4 Address Lease IPv6 Address Lease Resource Sponsoring

ASN Registration

Obtain your own Autonomous System Number to run BGP and multi-home your network.
Learn more

IPv4 Address Lease

Lease routable IPv4 space without the upfront cost of buying address blocks.
Learn more

IPv6 Address Lease

Move to IPv6 with ready-to-route address ranges and full LIR sponsorship.
Learn more

Resource Sponsoring

We act as your Local Internet Registry so you can hold RIPE resources directly.
Learn more
Resources

CIDR to IP Range Device Fingerprint Geofeed Checker Image Location Anonymizer IP Map IP to Number IPv6 Expander MCP Server Pingable IP Finder Reverse DNS Lookup Summarize IPs Traceroute

CIDR to IP Range

Convert CIDR blocks to first/last addresses and back to minimal CIDR lists.
Convert CIDR

Device Fingerprint

See the device and browser details websites can read and the fingerprint they add up to.
Inspect Device

Geofeed Checker

Validate an RFC 8805 geofeed from a URL or raw CSV and get per-line errors.
Check Geofeed

Image Location Anonymizer

Strip GPS and other location metadata from JPEG and PNG photos.
Anonymize Image

IP Map

Plot a list of IP addresses on a world map using Ipregistry geolocation.
Map IPs

IP to Number

Convert IPv4 and IPv6 addresses to their numeric form and back.
Convert IP

IPv6 Expander

Expand an IPv6 address to its full form or collapse it to the RFC 5952 shorthand.
Expand IPv6

MCP Server

Give LLMs and AI agents live IP geolocation, threat, ASN and user agent data over the Model Context Protocol.
Connect your agent

Pingable IP Finder

Check which IP addresses answer ICMP echo requests.
Find Pingable IPs

Reverse DNS Lookup

Find the PTR hostname behind any IPv4 or IPv6 address.
Lookup Reverse DNS

Summarize IPs

Get visual insights for a list of IPs: countries, networks, and threat signals.
Summarize IPs

Traceroute

Trace the network path to any IPv4 or IPv6 host, with per-hop geolocation.
Run Traceroute
Docs
Pricing
Status
Login
Dashboard
Sign Up for Free

Summary

Country	United States
Organization	Washington University
Domain	wustl.edu
Number of IPv4	73,984
Number of IPv6	1.5846× 10²⁹
AS Type	Education
Registry	ARIN
Allocated	March 16, 1993 (about 33 years ago)
Updated	April 02, 2012 (about 14 years ago)

IP Ranges

AS2552 announces 3 IPv4 ranges and 2 IPv6 ranges.

That's a total of 73,984 IPv4 addresses and 1.5846× 10²⁹ IPv6 addresses.

Prefix	Organization	Size	Registry	Status
65.254.96.0/19	St Louis Internet2 Access Consortium LLC	8,192	ARIN	ALLOCATION
128.252.0.0/16	Washington University	65,536	ARIN	ALLOCATION
192.31.46.0/24	Washington University	256	ARIN	ALLOCATION

Prefix	Organization	Size	Registry	Status
2604:3e00::/32	Washington University	7.9228× 10²⁸	ARIN	ALLOCATION
2606:fd80::/32	St Louis Internet2 Access Consortium LLC	7.9228× 10²⁸	ARIN	ALLOCATION

AS2552 does not have any direct peering agreements. Instead, its global connectivity is achieved through transit providers. While this setup ensures comprehensive reach, future peering could reduce latency and optimize route efficiency.

AS2552 connects to the global Internet via at least 3 upstream providers. In this setup, AS2552 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.

AS174 AS3356 AS11537

AS2552 currently has no downstream networks, meaning it does not serve as a transit provider to customer networks.

Learn more

Get started with 20,000 free lookups: sign up