AS81 Ncren

NCREN ARIN 132 IPv4 prefixes 4 IPv6 prefixes

IPv4 addresses

1,995,520

IPv6 /48 networks

1,114,624

RPKI

106 valid30 no ROA

Peers and downstreams

Holder

AS name: NCREN
Description: MCNC ASN for NCREN
Organisation: Not published
Abuse contact: Not published
Registered: 1986-08-07
Record last changed: 2026-06-10 17:54 UTC

128.109.0.0/16 152.10.0.0/16 152.11.0.0/16 152.12.0.0/16 152.18.0.0/16 152.20.0.0/16 152.21.0.0/16 152.22.0.0/16 152.22.32.0/21 152.22.40.0/21 152.22.48.0/21 152.22.64.0/21 152.22.72.0/21 152.22.80.0/21 152.26.0.0/16 152.26.208.0/24 152.26.209.0/24 152.26.210.0/24 152.26.211.0/24 152.26.212.0/24 152.26.213.0/24 152.26.44.0/24 152.26.69.0/24 152.27.0.0/16 152.27.12.0/24 152.28.0.0/16 152.28.1.0/24 152.29.0.0/16 152.30.0.0/16 152.30.10.0/24 152.30.92.0/22 152.30.92.0/24 152.32.0.0/18 152.38.0.0/18 152.38.160.0/19 152.38.17.0/24 152.38.18.0/24 152.38.192.0/20 152.38.208.0/20 152.38.224.0/19 152.38.64.0/19 152.4.0.0/16 152.40.0.0/16 152.42.64.0/18 152.45.0.0/16 152.45.1.0/24 152.45.10.0/24 152.45.11.0/24 152.45.15.0/24 152.45.2.0/24 152.45.20.0/24 152.45.3.0/24 152.45.4.0/24 152.45.5.0/24 152.45.6.0/24 152.45.8.0/24 152.45.9.0/24 152.46.0.0/16 152.46.1.0/24 152.46.12.0/24 152.46.13.0/24 152.46.14.0/24 152.46.15.0/24 152.46.16.0/21 152.46.2.0/24 152.46.24.0/24 152.46.25.0/24 152.46.252.0/22 152.46.26.0/24 152.46.27.0/24 152.46.28.0/24 152.46.29.0/24 152.46.3.0/24 152.46.30.0/24 152.46.31.0/24 152.46.32.0/24 152.46.33.0/24 152.46.34.0/24 152.46.35.0/24 152.46.36.0/24 152.46.37.0/24 152.46.38.0/24 152.46.39.0/24 152.46.4.0/24 152.46.42.0/24 152.46.43.0/24 152.46.44.0/24 152.46.45.0/24 152.46.47.0/24 152.46.48.0/24 152.46.5.0/24 152.46.6.0/24 152.46.7.0/24 152.46.8.0/24 152.46.9.0/24 152.47.0.0/16 152.48.0.0/16 152.49.0.0/16 152.54.0.0/16 152.54.0.0/20 152.6.0.0/16 152.60.0.0/16 152.60.4.0/24 152.8.0.0/16 152.9.0.0/16 185.83.159.0/24 192.101.21.0/24 192.101.22.0/23 192.101.22.0/24 192.101.24.0/24 192.137.210.0/24 192.154.33.0/24 192.154.43.0/24 192.154.48.0/24 192.154.55.0/24 192.154.58.0/24 192.154.60.0/24 192.154.61.0/24 192.154.66.0/24 192.154.76.0/23 192.154.95.0/24 192.189.244.0/24 198.85.0.0/16 198.86.0.0/16 198.86.244.0/22 204.84.0.0/15 204.84.112.0/21 204.84.120.0/24 204.84.80.0/20 204.85.192.0/18 206.107.110.0/24 206.211.64.0/19

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade C · 69/100

partly	Prefixes covered by valid ROAs 106 of 136 announced prefixes are RPKI valid, 30 have no ROA.	19/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 4 IPv6 prefixes.	15/15
pass	More than one upstream 5 upstreams seen in BGP.	10/10
fail	Working abuse contact No abuse contact is published in the registry.	0/15
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
pass	Registry record maintained Last changed 2026-06-10.	5/5

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/81"><img src="https://ip-fd.net/badge/asn/81/health.svg" alt="AS81 network health on IP-FD.net"></a>

Markdown

[![AS81 network health](https://ip-fd.net/badge/asn/81/health.svg)](https://ip-fd.net/asn/81)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

2026-10-04 04:39 UTC	New neighbour	AS47098	downstream
2026-10-04 04:39 UTC	Relationship changed	AS6461	upstream to peer
2026-10-04 04:39 UTC	Relationship changed	AS11537	upstream to peer
2026-10-04 04:39 UTC	Prefix gone	152.35.0.0/16

WHOIS

aut-num:        AS81
as-name:        NCREN
handle:         AS81
registrant:     MCNC-Z (MCNC)
technical:      NH34-ORG-ARIN (NCREN Hostmaster) <hostmaster@ncren.net>
last changed:   2026-06-10T13:54:37-04:00
registration:   1986-08-07T00:00:00-04:00
source:         ARIN (RDAP)

Routing data

Updated 16 h ago

Registry record

Fetched 16 h ago from ARIN RDAP

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/81

const res = await fetch('https://ip-fd.net/api/v1/asn/81', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/81', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/81');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/81", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

AS174
AS3356	Level 3 Parent, LLC LEVEL3
AS7018	AT&T Enterprises, LLC ATT-INTERNET4
AS11164	Internet2 INTERNET2-I2PX
AS11426	Charter Communications Inc TWC-11426-CAROLINAS

AS6559	State of NC - State Telecommunications Services NCIH
AS10952	East Carolina University ECU-AS
AS11442	North Carolina State University NCSU
AS13371	Duke University DUKE-INTERCHANGE
AS13862	North Carolina State University NCSU-SNARE
AS18538	Wake County Public School System WCPSS-BOE
AS19161	Apogee Telecom Inc. APOG-UNCC-NORTH
AS19413	Roanoke Connect ROANOKE-CONNECT-ASN-1
AS19718	MCNC NCNI
AS20197	Castle & Cooke North Carolina, LLC NCRC-KANNAPOLIS
AS22862	Clinton City Schools CLINTON-CITY-SCHOOLS
AS26407	Carolina Digital Phone, Inc. CAROLINA-DIGITAL-PHONE
AS26741	CarolinaEast Medical Center CEMC
AS32417	Elon University ELONU-AS
AS32711	Wake County Government WCGNC
AS33401	Cpcc CPCC
AS36850	University of North Carolina at Chapel Hill UNC-CH
AS40245	Wake Forest University WAKE-FOREST-UNIVERSITY
AS46255	Charlotte-Mecklenburg Schools CHARLOTTE-MECKLENBURG-SCHOOLS-NC
AS46794	Pender County Schools PENDER COUNTY SCHOOLS
AS46963	City of Winston-Salem CITY-WINSTON-SALEM-AS
AS47098	Sampson County Schools SAMPSON COUNTY SCHOOLS
AS53384	University of North Carolina at Charlotte UNCC-AS
AS53785	University of North Carolina at Greensboro UNC-GREENSBORO
AS393824	Apogee Telecom Inc. APOG-LENOIR-RHYNE
AS393875	University of Mount Olive, Inc. UMO-AS
AS394165	City of Greenville, NC COGNC
AS394407	Cccc-Nc CCCC-NC
AS395465	Apogee Telecom Inc. APOG-UNCC-SOUTH
AS396028	Vidant Health VIDANTHEALTH
AS396391	Guilford College GUILFORD-COLLEGE
AS396837	North Carolina State Education Assistance Authority SEAA18
AS396978	Orange Water and Sewer Authority ORANGE-WATER-SEWER-AUTHORITY
AS398580	Queens University of Charlotte QUEENS-UNIV-CLT-01
AS399050	Rowan-Cabarrus Community College ROW-CAB-01
AS399407	Salem Academy and College SALEM-AC-01
AS399565
AS399708	Ncwc-Arin-Asn NCWC-ARIN-ASN
AS400959	Town of Cary CARYNC

AS6461	Zayo Bandwidth ZAYO-6461
AS11537	Internet2 INTERNET2-RESEARCH-EDU