81 NCREN, US
Adjacency: 45 Upstream: 7 Downstream: 38
Upstream Adjacent AS list
AS6461 ZAYO-6461, US
AS11164 INTERNET2-I2PX, US
AS174 COGENT-174, US
AS3356 LEVEL3, US
AS11426 TWC-11426-CAROLINAS, US
AS7018 ATT-INTERNET4, US
AS11537 INTERNET2-RESEARCH-EDU, US
Downstream Adjacent AS list
AS396837 SEAA18, US
AS393824 APOG-LENOIR-RHYNE, US
AS32711 WCGNC, US
AS398580 QUEENS-UNIV-CLT-01, US
AS46794 -Reserved AS-, ZZ
AS19413 ROANOKE-CONNECT-ASN-1, US
AS18538 WCPSS-BOE, US
AS19718 NCNI, US
AS26741 CEMC, US
AS396978 CARGURUS-01, US
AS399565 SHAWU-AS01, US
AS11442 NCSU, US
AS10952 ECU-AS, US
AS13862 NCSU-SNARE, US
AS13371 DUKE-INTERCHANGE, US
AS20197 NCRC-KANNAPOLIS, US
AS33401 CPCC, US
AS32417 ELONU-AS, US
AS22862 -Reserved AS-, ZZ
AS394165 COGNC, US
AS393875 UMO-AS, US
AS394407 TRIAGE-CONSULTING-GROUP, US
AS36850 UNC-CH, US
AS396028 VIDANTHEALTH, US
AS399050 ROW-CAB-01, US
AS399407 SALEM-AC-01, US
AS396391 GUILFORD-COLLEGE, US
AS399708 NCWC-ARIN-ASN, US
AS46963 CITY-WINSTON-SALEM-AS, US
AS46255 CHARLOTTE-MECKLENBURG-SCHOOLS-NC, US
AS47098 -Reserved AS-, ZZ
AS40245 WAKE-FOREST-UNIVERSITY, US
AS53384 UNCC-AS, US
AS53785 UNC-GREENSBORO, US
AS6559 NCIH, US
AS400959 CARYNC, US
AS395465 APOG-UNCC-SOUTH, US
AS19161 APOG-UNCC-NORTH, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 253 AS81 ORG+TRN Originate: 2154496 /10.96 Transit: 1449984 /11.53 NCREN, US
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 761 AS81 NCREN, US 142 98 9 53 89 62.68% Prefix AS Path Aggregation Suggestion 128.109.0.0/16 11537 81 152.4.0.0/16 11537 81 152.6.0.0/16 11537 81 152.8.0.0/14 11537 81 + Announce - aggregate of 152.8.0.0/15 (11537 81) and 152.10.0.0/15 (11537 81) 152.8.0.0/16 11537 81 - Withdrawn - aggregated with 152.9.0.0/16 (11537 81) 152.9.0.0/16 11537 81 - Withdrawn - aggregated with 152.8.0.0/16 (11537 81) 152.10.0.0/16 11537 81 - Withdrawn - aggregated with 152.11.0.0/16 (11537 81) 152.11.0.0/16 11537 81 - Withdrawn - aggregated with 152.10.0.0/16 (11537 81) 152.12.0.0/16 11537 81 152.18.0.0/16 11537 81 152.20.0.0/15 11537 81 + Announce - aggregate of 152.20.0.0/16 (11537 81) and 152.21.0.0/16 (11537 81) 152.20.0.0/16 11537 81 - Withdrawn - aggregated with 152.21.0.0/16 (11537 81) 152.21.0.0/16 11537 81 - Withdrawn - aggregated with 152.20.0.0/16 (11537 81) 152.22.0.0/16 11537 81 152.22.32.0/20 7018 81 + Announce - aggregate of 152.22.32.0/21 (7018 81) and 152.22.40.0/21 (7018 81) 152.22.32.0/21 7018 81 - Withdrawn - aggregated with 152.22.40.0/21 (7018 81) 152.22.40.0/21 7018 81 - Withdrawn - aggregated with 152.22.32.0/21 (7018 81) 152.22.48.0/21 11537 81 - Withdrawn - matching aggregate 152.22.0.0/16 11537 81 152.22.64.0/21 11537 81 - Withdrawn - matching aggregate 152.22.0.0/16 11537 81 152.22.72.0/21 11537 81 - Withdrawn - matching aggregate 152.22.0.0/16 11537 81 152.22.80.0/21 11537 81 - Withdrawn - matching aggregate 152.22.0.0/16 11537 81 152.26.0.0/15 11537 81 + Announce - aggregate of 152.26.0.0/16 (11537 81) and 152.27.0.0/16 (11537 81) 152.26.0.0/16 11537 81 - Withdrawn - aggregated with 152.27.0.0/16 (11537 81) 152.26.16.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.44.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.60.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.69.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.208.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.209.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.210.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.211.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.212.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.26.213.0/24 11537 81 - Withdrawn - matching aggregate 152.26.0.0/16 11537 81 152.27.0.0/16 11537 81 - Withdrawn - aggregated with 152.26.0.0/16 (11537 81) 152.27.12.0/24 7018 81 152.28.0.0/15 11537 81 + Announce - aggregate of 152.28.0.0/16 (11537 81) and 152.29.0.0/16 (11537 81) 152.28.0.0/16 11537 81 - Withdrawn - aggregated with 152.29.0.0/16 (11537 81) 152.28.1.0/24 11537 81 - Withdrawn - matching aggregate 152.28.0.0/16 11537 81 152.29.0.0/16 11537 81 - Withdrawn - aggregated with 152.28.0.0/16 (11537 81) 152.30.0.0/16 11537 81 152.30.10.0/24 11537 81 - Withdrawn - matching aggregate 152.30.0.0/16 11537 81 152.30.92.0/22 2914 174 81 152.30.92.0/24 11537 81 152.32.0.0/18 11537 81 152.35.0.0/16 11537 81 152.38.0.0/18 11537 81 152.38.17.0/24 11537 81 - Withdrawn - matching aggregate 152.38.0.0/18 11537 81 152.38.18.0/24 11537 81 - Withdrawn - matching aggregate 152.38.0.0/18 11537 81 152.38.64.0/19 11537 81 152.38.160.0/19 11537 81 152.38.192.0/18 11537 81 + Announce - aggregate of 152.38.192.0/19 (11537 81) and 152.38.224.0/19 (11537 81) 152.38.192.0/20 11537 81 - Withdrawn - aggregated with 152.38.208.0/20 (11537 81) 152.38.208.0/20 11537 81 - Withdrawn - aggregated with 152.38.192.0/20 (11537 81) 152.38.224.0/19 11537 81 - Withdrawn - aggregated with 152.38.192.0/19 (11537 81) 152.40.0.0/16 11537 81 152.42.64.0/18 11537 81 152.45.0.0/16 11537 81 152.45.1.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.2.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.3.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.4.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.5.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.6.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.8.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.9.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.10.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.11.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.15.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.45.20.0/24 11537 81 - Withdrawn - matching aggregate 152.45.0.0/16 11537 81 152.46.0.0/16 11537 81 152.46.1.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.2.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.3.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.4.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.5.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.6.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.7.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.8.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.9.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.12.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.13.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.14.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.15.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.16.0/21 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.24.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.25.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.26.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.27.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.28.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.29.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.30.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.31.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.32.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.33.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.34.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.35.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.36.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.37.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.38.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.39.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.42.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.43.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.44.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.45.0/24 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.46.47.0/24 3303 3356 81 152.46.48.0/24 57866 3356 81 152.46.252.0/22 11537 81 - Withdrawn - matching aggregate 152.46.0.0/16 11537 81 152.47.0.0/16 7018 81 152.48.0.0/15 7018 81 + Announce - aggregate of 152.48.0.0/16 (7018 81) and 152.49.0.0/16 (7018 81) 152.48.0.0/16 7018 81 - Withdrawn - aggregated with 152.49.0.0/16 (7018 81) 152.49.0.0/16 7018 81 - Withdrawn - aggregated with 152.48.0.0/16 (7018 81) 152.54.0.0/16 11537 81 152.54.0.0/20 11537 81 - Withdrawn - matching aggregate 152.54.0.0/16 11537 81 152.55.0.0/17 57866 3356 81 + Announce - aggregate of 152.55.0.0/18 (57866 3356 81) and 152.55.64.0/18 (57866 3356 81) 152.55.0.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.16.0/20 (57866 3356 81) 152.55.16.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.0.0/20 (57866 3356 81) 152.55.32.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.48.0/20 (57866 3356 81) 152.55.48.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.32.0/20 (57866 3356 81) 152.55.64.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.80.0/20 (57866 3356 81) 152.55.80.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.64.0/20 (57866 3356 81) 152.55.96.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.112.0/20 (57866 3356 81) 152.55.112.0/20 57866 3356 81 - Withdrawn - aggregated with 152.55.96.0/20 (57866 3356 81) 152.60.0.0/16 11537 81 152.60.4.0/24 2497 174 81 192.101.21.0/24 11537 81 192.101.22.0/23 3303 11164 81 192.101.22.0/24 11537 81 192.101.24.0/24 11537 81 192.137.210.0/24 11537 81 192.154.33.0/24 11537 81 192.154.43.0/24 11537 81 192.154.48.0/24 7018 81 192.154.55.0/24 11537 81 192.154.58.0/24 7018 81 192.154.60.0/23 7018 81 + Announce - aggregate of 192.154.60.0/24 (7018 81) and 192.154.61.0/24 (7018 81) 192.154.60.0/24 7018 81 - Withdrawn - aggregated with 192.154.61.0/24 (7018 81) 192.154.61.0/24 7018 81 - Withdrawn - aggregated with 192.154.60.0/24 (7018 81) 192.154.66.0/24 7018 81 192.154.76.0/23 7018 81 192.154.95.0/24 7018 81 192.189.244.0/24 11537 81 198.85.0.0/16 11537 81 198.86.0.0/16 11537 81 198.86.244.0/22 11537 81 - Withdrawn - matching aggregate 198.86.0.0/16 11537 81 204.84.0.0/15 11537 81 204.84.80.0/20 11537 81 - Withdrawn - matching aggregate 204.84.0.0/15 11537 81 204.84.112.0/21 11537 81 - Withdrawn - matching aggregate 204.84.0.0/15 11537 81 204.84.120.0/24 11537 81 - Withdrawn - matching aggregate 204.84.0.0/15 11537 81 204.85.192.0/18 11537 81 - Withdrawn - matching aggregate 204.84.0.0/15 11537 81 206.107.110.0/24 49788 174 81 206.211.64.0/19 11537 81
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS81 93 More Specifics 145 Total Advertisements NCREN, US
152.22.64.0/21 152.22.0.0/16
152.22.72.0/21 152.22.0.0/16
152.22.80.0/21 152.22.0.0/16
152.26.16.0/24 152.26.0.0/16
152.26.44.0/24 152.26.0.0/16
152.26.60.0/24 152.26.0.0/16
152.26.69.0/24 152.26.0.0/16
152.26.87.0/24 152.26.0.0/16
152.26.176.0/24 152.26.0.0/16
152.26.177.0/24 152.26.0.0/16
152.26.178.0/24 152.26.0.0/16
152.26.179.0/24 152.26.0.0/16
152.26.180.0/24 152.26.0.0/16
152.26.181.0/24 152.26.0.0/16
152.26.182.0/24 152.26.0.0/16
152.26.192.0/24 152.26.0.0/16
152.26.193.0/24 152.26.0.0/16
152.26.194.0/24 152.26.0.0/16
152.26.195.0/24 152.26.0.0/16
152.26.197.0/24 152.26.0.0/16
152.26.198.0/24 152.26.0.0/16
152.26.199.0/24 152.26.0.0/16
152.26.200.0/24 152.26.0.0/16
152.26.201.0/24 152.26.0.0/16
152.26.208.0/24 152.26.0.0/16
152.26.209.0/24 152.26.0.0/16
152.26.210.0/24 152.26.0.0/16
152.26.211.0/24 152.26.0.0/16
152.26.212.0/24 152.26.0.0/16
152.26.213.0/24 152.26.0.0/16
152.26.228.0/24 152.26.0.0/16
152.26.230.0/24 152.26.0.0/16
152.28.1.0/24 152.28.0.0/16
152.30.10.0/24 152.30.0.0/16
152.30.92.0/22 152.30.0.0/16
152.30.92.0/24 152.30.0.0/16
152.45.1.0/24 152.45.0.0/16
152.45.2.0/24 152.45.0.0/16
152.45.3.0/24 152.45.0.0/16
152.45.4.0/24 152.45.0.0/16
152.45.5.0/24 152.45.0.0/16
152.45.6.0/24 152.45.0.0/16
152.45.8.0/24 152.45.0.0/16
152.45.9.0/24 152.45.0.0/16
152.45.10.0/24 152.45.0.0/16
152.45.11.0/24 152.45.0.0/16
152.45.15.0/24 152.45.0.0/16
152.45.20.0/24 152.45.0.0/16
152.46.1.0/24 152.46.0.0/16
152.46.2.0/24 152.46.0.0/16
152.46.3.0/24 152.46.0.0/16
152.46.4.0/24 152.46.0.0/16
152.46.5.0/24 152.46.0.0/16
152.46.6.0/24 152.46.0.0/16
152.46.7.0/24 152.46.0.0/16
152.46.8.0/24 152.46.0.0/16
152.46.9.0/24 152.46.0.0/16
152.46.12.0/24 152.46.0.0/16
152.46.13.0/24 152.46.0.0/16
152.46.14.0/24 152.46.0.0/16
152.46.15.0/24 152.46.0.0/16
152.46.16.0/21 152.46.0.0/16
152.46.24.0/24 152.46.0.0/16
152.46.25.0/24 152.46.0.0/16
152.46.26.0/24 152.46.0.0/16
152.46.27.0/24 152.46.0.0/16
152.46.28.0/24 152.46.0.0/16
152.46.29.0/24 152.46.0.0/16
152.46.30.0/24 152.46.0.0/16
152.46.31.0/24 152.46.0.0/16
152.46.32.0/24 152.46.0.0/16
152.46.33.0/24 152.46.0.0/16
152.46.34.0/24 152.46.0.0/16
152.46.35.0/24 152.46.0.0/16
152.46.36.0/24 152.46.0.0/16
152.46.37.0/24 152.46.0.0/16
152.46.38.0/24 152.46.0.0/16
152.46.39.0/24 152.46.0.0/16
152.46.42.0/24 152.46.0.0/16
152.46.43.0/24 152.46.0.0/16
152.46.44.0/24 152.46.0.0/16
152.46.45.0/24 152.46.0.0/16
152.46.252.0/22 152.46.0.0/16
152.54.0.0/20 152.54.0.0/16
152.60.4.0/24 152.60.0.0/16
192.101.22.0/24 192.101.22.0/23
192.137.210.0/24 192.137.208.0/20
198.86.244.0/22 198.86.0.0/16
204.84.80.0/20 204.84.0.0/15
204.84.112.0/21 204.84.0.0/15
204.84.120.0/24 204.84.0.0/15
204.85.192.0/18 204.84.0.0/15
206.107.110.0/24 206.104.0.0/14
152.46.47.0/24 152.46.0.0/16
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 192.154.41.0/24 Announced
+ 192.154.62.0/24 Announced
- 152.46.47.0/24 Withdrawn
whois: 402603
IANA has recorded AS81 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS81\n
#
# 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/
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# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
ASNumber: 81
ASName: NCREN
ASHandle: AS81
RegDate: 1986-08-07
Updated: 2021-06-29
Ref: https://rdap.arin.net/registry/autnum/81
OrgName: MCNC
OrgId: MCNC-Z
Address: 3021 E. Cornwallis Rd
City: Durham
StateProv: NC
PostalCode: 27713-2852
Country: US
RegDate: 2021-06-14
Updated: 2026-02-12
Ref: https://rdap.arin.net/registry/entity/MCNC-Z
OrgTechHandle: NCREN-ARIN
OrgTechName: NCREN Hostmaster
OrgTechPhone: +1-919-248-1405
OrgTechEmail: hostmaster@ncren.net
OrgTechRef: https://rdap.arin.net/registry/entity/NCREN-ARIN
OrgAbuseHandle: ABUSE3348-ARIN
OrgAbuseName: Abuse Contact
OrgAbusePhone: +1-919-248-4111
OrgAbuseEmail: abuse@mcnc.org
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE3348-ARIN
RTechHandle: NH34-ORG-ARIN
RTechName: NCREN Hostmaster
RTechPhone: +1-919-248-1405
RTechEmail: hostmaster@ncren.net
RTechRef: https://rdap.arin.net/registry/entity/NH34-ORG-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.
#