How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS399397 Thomas Jefferson Foundation, Inc.

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

ASN Lookup Tool

Search ASN

AS Data

IP Routes

Raw Whois

Parsed Whois

Peers

Upstreams

Downstreams

Legacy Routes

Thomas Jefferson Foundation, Inc. monticello.org

US 0 Routes

AS Data

AS399397

AS399397 – Thomas Jefferson Foundation, Inc.

AS Number	399397
AS Name	BLOCK-NEW
Organization	Thomas Jefferson Foundation, Inc.(tjf-3)
Country	US
Website	monticello.org
Number of IPv4 Routes	0
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2021-03-01

ASN Intelligence API for production workflows

Use ASN data for AS399397 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       399397
ASName:         BLOCK-NEW
ASHandle:       AS399397
RegDate:        2021-03-01
Updated:        2021-03-01    
Ref:            https://rdap.arin.net/registry/autnum/399397


OrgName:        Thomas Jefferson Foundation, Inc.
OrgId:          TJF-3
Address:        PO Box 316
City:           Charlottesville
StateProv:      VA
PostalCode:     22902
Country:        US
RegDate:        2018-04-13
Updated:        2018-04-13
Ref:            https://rdap.arin.net/registry/entity/TJF-3


OrgAbuseHandle: OBERG5-ARIN
OrgAbuseName:   Oberg, Ryan 
OrgAbusePhone:  +1-540-292-7578 
OrgAbuseEmail:  roberg@monticello.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/OBERG5-ARIN

OrgTechHandle: OBERG5-ARIN
OrgTechName:   Oberg, Ryan 
OrgTechPhone:  +1-540-292-7578 
OrgTechEmail:  roberg@monticello.org
OrgTechRef:    https://rdap.arin.net/registry/entity/OBERG5-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Frequently Asked Questions

What is ASN AS399397?

ASN AS399397 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS399397?

AS399397 is listed under Thomas Jefferson Foundation, Inc..

What do peers, upstreams, and downstreams mean?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.