AS4911 CenturyLink Communications, LLC

CENTURYLINK-LEGACY-QWEST-SPA-MARION - CenturyLink Communications, LLC · registered in the United States

IPv4 addresses16,3841 prefixes · <0.001% of announced IPv4

Rank in United States#2,347largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#6,986of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS4911 in ASN lookup Look up an IP in this network (168.251.0.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

168.251.0.0/18

Other ASNs named CenturyLink Communications, LLC

27 other networks use the same organisation name; together with AS4911 they announce 24,368,896 IPv4 addresses.

ASNNameIPv4 addresses

AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC US15,739,648

AS3561CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications, LLC US6,397,952

AS22561CENTURYLINK-LEGACY-LIGHTCORE - CenturyLink Communications, LLC US1,228,800

AS2379CENTURYLINK-LEGACY-EMBARQ-WNPK - CenturyLink Communications, LLC US547,840

AS11398CENTURYLINK-LEGACY-EMBARQ-LVGS - CenturyLink Communications, LLC US121,088

AS17402CENTURYLINK-LEGACY-EMBARQ-CHSK - CenturyLink Communications, LLC US68,864

AS14921CENTURYLINK-LEGACY-EMBARQ-HDRV - CenturyLink Communications, LLC US61,440

AS6222CENTURYLINK-LEGACY-EMBARQ-CLTN - CenturyLink Communications, LLC US59,136

AS16941CENTURYLINK-LEGACY-FUSEPOINT-CTS-CANADA-POP - CenturyLink Communications, LLC US15,616

AS7359CENTURYLINK-SPA-ZUNI - CenturyLink Communications, LLC US14,592

AS4015CENTURYLINK-LEGACY-QWEST-SPA-OMAHA - CenturyLink Communications, LLC US14,336

AS3910CENTURYLINK-EUROPE-LEGACY-QWEST - CenturyLink Communications, LLC US13,824

AS22186CENTURYLINK-LEGACY-EMBARQ-KSGRNR - CenturyLink Communications, LLC US13,312

AS393789CENTURYLINK-CHIA-PROJECT - CenturyLink Communications, LLC US13,312

AS23126CENTURYLINK-CLEC-VARIOUS-SHARED-USE-AND-LOCATIONS - CenturyLink Communications, LLC US8,960

AS3909CENTURYLINK-LEGACY-QWEST-VDOC - CenturyLink Communications, LLC US6,912

AS4282CENTURYLINK-TSDS-FLFTMY - CenturyLink Communications, LLC US5,888

AS4283CENTURYLINK-TSDS-LSVG - CenturyLink Communications, LLC US4,864

AS4284CENTURYLINK-TSDS-FLTLHS - CenturyLink Communications, LLC US4,608

AS13787CENTURYLINK-LEGACY-EMBARQ-JCTY - CenturyLink Communications, LLC US3,328

AS6223CENTURYLINK-MTIPS1-STN - CenturyLink Communications, LLC US2,560

AS5778CENTURYLINK-LEGACY-EMBARQ-RCMT - CenturyLink Communications, LLC US1,792

AS7191CENTURYLINK-PRISM - CenturyLink Communications, LLC US1,536

AS4297CENTURYLINK-MTIPS4-HLR - CenturyLink Communications, LLC US1,024

AS7988CENTURYLINK-SPA-SINGAPORE - CenturyLink Communications, LLC US768

AS6224CENTURYLINK-MTIPS2-CHI - CenturyLink Communications, LLC US256

AS16835CENTURYLINK-LEGACY-MR-MEBLANE-AND-RCMT - CenturyLink Communications, LLC US256

Similar-sized networks in United States

ASNNameIPv4 addresses

AS1399#2344 CHARLES-SCHWAB-2 - Charles Schwab & Co., Inc.16,384

AS1567#2345 DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD)16,384

AS1648#2346 JEFFERSON-PARISH-SCHOOL-BOARD - Jefferson Parish School Board16,384

AS4991#2348 COGENT-4991-4994 - Cogent Communications, LLC16,384

AS5101#2349 LEECOUNTYSCHOOLS - The School District of Lee County16,384

AS6646#2350 AETNA - Aetna, Inc.16,384

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources