AS103 · US — Northwestern University

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NWU-AS · ARIN · US

Identity source

AS103 ·

US Northwestern University

NRO allocation data

22IPv4 prefixes

1IPv6 prefixes

2Observed neighbors

RPKIValid: 0 Invalid: 0 Not found: 23 Unknown: 0

Selected local snapshot coverage; not the whole Internet. BGP snapshots: ris-rrc00 10 Oct 16:00 UTC; routeviews2 10 Oct 22:00 UTC; routeviews6 10 Oct 22:00 UTC. Validator: 10 Oct 23:15 UTC. Publication-point issues: 88

Address space details

Overlapping originated prefixes counted once. IPv4 addresses: 149,504

IPv6 addresses: 154742504910672534362390528

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Observed originated prefixes

These are observed BGP origins, not an inventory of registered allocations or transit reachability.

22 matching prefix–origin pairs. Each pair appears once; source observations are in Details.

Prefix	RPKI	Last observed	Details
8.28.178.0/23	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
8.30.248.0/22	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
38.124.97.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
129.105.0.0/16	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.0.0/17	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.128.0/19	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.160.0/20	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.176.0/21	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.184.0/23	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.186.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.192.0/19	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.224.0/21	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.232.0/22	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
165.124.240.0/20	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
192.5.143.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
192.26.85.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
192.26.86.0/23	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
192.31.253.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
199.74.64.0/18	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
199.249.165.0/24	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
199.249.166.0/23	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found
199.249.168.0/23	Not Found	10 Oct 22:00 UTC	2 source observations ris-rrc00 · 2026-10-10T16:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-10T22:00:00+00:00 · 1 selected peers · RPKI not_found

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Observed AS neighbors

2 unique neighbors in the selected local snapshots. This is the available collector dataset, not a complete map of the Internet. Adjacency does not establish upstream service or peering.

2 matching neighbors · 1–2 shown

Network	IPv4/IPv6	Seen in	Last observed	Details
AS174 · US Cogent Communications, LLC	IPv4	ris-rrc00	10 Oct 16:00 UTC	Source observations ris-rrc00 · IPv4 · 10 Oct 16:00 UTC
AS2381 · US WISCNET1-AS - WiscNet	IPv4	ris-rrc00, routeviews2	10 Oct 22:00 UTC	Source observations ris-rrc00 · IPv4 · 10 Oct 16:00 UTC routeviews2 · IPv4 · 10 Oct 22:00 UTC

Clear neighbor filters

View observed neighbor graph (up to 15 AS nodes)

Lines mean observed adjacency, with no commercial direction inferred. The table above provides the same evidence and source times.

Showing 2 of 2 matching neighbors, in table sort order, independent of table page.

Peering & locations

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Registry information

ARIN · fetched 10 Oct 21:05 UTC

Resource name: NWU-AS
Handle: AS103
RDAP country: Not supplied
ASN: 103

Registered organizations

Northwestern University

Last Changed: 02 Apr 2012 14:31 UTC

Registration: 09 Apr 1987 04:00 UTC

Registry contacts and maintainers

NUNS-ARIN · abuse
NUN-ARIN · noc
NUNA-ARIN · technical

Official registry record

Registry source

Allocation statistics

NRO/RIR delegated-extended records describe allocation or assignment ranges. They do not prove a BGP announcement or replace more-specific RDAP registration information. Country is the allocation record’s registration country, not the physical location of every address.

AS103–AS103 · arin · assigned · ASN allocation country: US · Allocation date: 1987-04-09 — NRO/RIR data · snapshot 10 Oct 00:00 UTC

NRO data and format

Prefix count history

Local observation changes

Only comparable successful snapshots are compared. First imports, changed peer coverage and collection gaps are baselines, not new global routes or withdrawals. RPKI transition history is not available before it has been recorded.

No retained changes are available for this resource.

Retained local prefix-count observations

Separate collector series. Missing rows are not zero. Peer-set changes are separate coverage, not a continuous trend.

Source	Snapshot	Family	Prefixes	Peer coverage
routeviews2	10 Oct 22:00 UTC	IPv4	22	140.192.8.16/IPv4
routeviews6	10 Oct 22:00 UTC	IPv6	1	2406:840:feed:2::1/IPv6
routeviews2	10 Oct 20:00 UTC	IPv4	22	140.192.8.16/IPv4
routeviews6	10 Oct 20:00 UTC	IPv6	1	2406:840:feed:2::1/IPv6
ris-rrc00	10 Oct 16:00 UTC	IPv4	22	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 16:00 UTC	IPv6	1	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 08:00 UTC	IPv4	22	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 08:00 UTC	IPv6	1	2a00:5884::6/IPv6, 89.234.186.6/IPv4