[REN-BGP-stats-all] IPv4 R&E Routing Table Report - CERNET (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Sun Mar 30 20:10:43 UTC 2025
IPv4 R&E Routing Table Report 20:10 GMT Sun 30 Mar, 2025
IPv4 BGP Table (R&E) as seen at CERNET.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/CERNET/
Analysis Summary
----------------
BGP routing table entries examined: 17954
Prefixes after maximum aggregation (per Origin AS): 9947
Deaggregation factor: 1.80
Unique aggregates announced (without unneeded subnets): 11013
Number of IPv4 prefixes with a valid ROA: 7417
Number of IPv4 prefixes with an invalid ROA: 6
Number of IPv4 prefixes with no ROA: 10531
Total ASes present in the Internet Routing Table: 2666
Prefixes per ASN: 6.73
Origin-only ASes present in the Internet Routing Table: 2315
Origin ASes announcing only one prefix: 1030
Transit ASes present in the Internet Routing Table: 351
Transit-only ASes present in the Internet Routing Table: 62
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 17
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 1
Number of instances of unregistered ASNs: 1
Number of 32-bit ASNs allocated by the RIRs: 46117
Number of 32-bit ASNs visible in the Routing Table: 666
Prefixes from 32-bit ASNs in the Routing Table: 1839
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 191688976
Equivalent to 11 /8s, 108 /16s and 241 /24s
Percentage of available address space announced: 5.2
Percentage of allocated address space announced: 5.2
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 2244
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4178
Total APNIC prefixes after maximum aggregation: 2187
APNIC Deaggregation factor: 1.91
Prefixes being announced from the APNIC address blocks: 4178
Unique aggregates announced from the APNIC address blocks: 2605
APNIC Region origin ASes present in the Internet Routing Table: 584
APNIC Prefixes per ASN: 7.15
APNIC Region origin ASes announcing only one prefix: 246
APNIC Region transit ASes present in the Internet Routing Table: 46
Average APNIC Region AS path length visible: 4.3
Max APNIC Region AS path length visible: 13
Number of APNIC region 32-bit ASNs visible in the Routing Table: 237
Number of APNIC addresses announced to Internet: 44787456
Equivalent to 2 /8s, 171 /16s and 103 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 8023
Total ARIN prefixes after maximum aggregation: 4361
ARIN Deaggregation factor: 1.84
Prefixes being announced from the ARIN address blocks: 8036
Unique aggregates announced from the ARIN address blocks: 4802
ARIN Region origin ASes present in the Internet Routing Table: 1221
ARIN Prefixes per ASN: 6.58
ARIN Region origin ASes announcing only one prefix: 440
ARIN Region transit ASes present in the Internet Routing Table: 160
Average ARIN Region AS path length visible: 4.5
Max ARIN Region AS path length visible: 17
Number of ARIN region 32-bit ASNs visible in the Routing Table: 214
Number of ARIN addresses announced to Internet: 83037696
Equivalent to 4 /8s, 243 /16s and 14 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3621
Total RIPE prefixes after maximum aggregation: 2881
RIPE Deaggregation factor: 1.26
Prefixes being announced from the RIPE address blocks: 3607
Unique aggregates announced from the RIPE address blocks: 2933
RIPE Region origin ASes present in the Internet Routing Table: 653
RIPE Prefixes per ASN: 5.52
RIPE Region origin ASes announcing only one prefix: 282
RIPE Region transit ASes present in the Internet Routing Table: 103
Average RIPE Region AS path length visible: 4.0
Max RIPE Region AS path length visible: 13
Number of RIPE region 32-bit ASNs visible in the Routing Table: 149
Number of RIPE addresses announced to Internet: 58035984
Equivalent to 3 /8s, 117 /16s and 143 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1042
Total LACNIC prefixes after maximum aggregation: 377
LACNIC Deaggregation factor: 2.76
Prefixes being announced from the LACNIC address blocks: 1042
Unique aggregates announced from the LACNIC address blocks: 482
LACNIC Region origin ASes present in the Internet Routing Table: 121
LACNIC Prefixes per ASN: 8.61
LACNIC Region origin ASes announcing only one prefix: 51
LACNIC Region transit ASes present in the Internet Routing Table: 17
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 10
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 58
Number of LACNIC addresses announced to Internet: 3558912
Equivalent to 0 /8s, 54 /16s and 78 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1089
Total AfriNIC prefixes after maximum aggregation: 140
AfriNIC Deaggregation factor: 7.78
Prefixes being announced from the AfriNIC address blocks: 1089
Unique aggregates announced from the AfriNIC address blocks: 189
AfriNIC Region origin ASes present in the Internet Routing Table: 24
AfriNIC Prefixes per ASN: 45.38
AfriNIC Region origin ASes announcing only one prefix: 11
AfriNIC Region transit ASes present in the Internet Routing Table: 7
Average AfriNIC Region AS path length visible: 4.5
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 8
Number of AfriNIC addresses announced to Internet: 2268416
Equivalent to 0 /8s, 34 /16s and 157 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 624 2170 464 SINET-AS Research Organization of Informa
1237 194 74 146 KREONET-AS-KR KISTI, KR
58647 183 18 2 KAGAWAU-AS Kagawa University, JP
7575 174 297 117 AARNET-AS-AP Australian Academic and Rese
55824 147 19 21 NKN-CORE-NW NKN Core Network, IN
4538 114 4176 70 ERX-CERNET-BKB China Education and Resear
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 66 37 9 UNINET-AS-AP UNINET-, TH
1659 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA
23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2152 535 507 99 CENIC-2152, US
2920 226 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
18558 140 18 5 NETBLK-RCOEK, US
81 129 519 34 NCREN, US
23024 99 7 17 OCDE, US
21976 90 34 16 NJEDGE-NET, US
237 85 542 51 MERIT-AS-14, US
1736 79 16 1 MU-AS, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 249 DFN Verein zur Foerderung eines Deutschen
786 196 1750 188 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 108 24 5 ISU Internet Services Unit ISU, SA
1103 98 1743 84 SURFNET-NL SURFnet, The Netherlands, NL
2614 89 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
3267 79 29 69 NIKS, RU
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 236 178 41 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
271640 67 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
2715 52 100 36 Fundacao Carlos Chagas Filho de Amparo a
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
21612 29 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
20191 28 16 1 Pontificia Universidad Catolica de Chile,
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 546 82 3 KENET-AS, KE
2018 373 318 68 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 34 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
327798 4 0 3 BERNET, BI
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 624 2170 464 SINET-AS Research Organization of Informa
36914 546 82 3 KENET-AS, KE
2152 535 507 99 CENIC-2152, US
2018 373 318 68 TENET-1, ZA
680 284 1899 249 DFN Verein zur Foerderung eines Deutschen
1916 236 178 41 Rede Nacional de Ensino e Pesquisa, BR
2920 226 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
786 196 1750 188 JANET Jisc Services Limited, GB
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
36914 546 543 KENET-AS, KE
2152 535 436 CENIC-2152, US
2018 373 305 TENET-1, ZA
5786 199 198 UPRENET, PR
1916 236 195 Rede Nacional de Ensino e Pesquisa, BR
58647 183 181 KAGAWAU-AS Kagawa University, JP
2920 226 177 LACOE, US
18558 140 135 NETBLK-RCOEK, US
55824 147 126 NKN-CORE-NW NKN Core Network, IN
8895 108 103 ISU Internet Services Unit ISU, SA
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U
202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:1 /12:11
/13:19 /14:31 /15:110 /16:1898 /17:398 /18:437
/19:530 /20:766 /21:784 /22:1373 /23:1443 /24:10145
/25:4 /26:1 /27:0 /28:1 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 522 546 KENET-AS, KE
8895 105 108 ISU Internet Services Unit ISU, SA
2152 63 535 CENIC-2152, US
23024 38 99 OCDE, US
3267 35 79 NIKS, RU
32440 33 57 LONI, US
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
200521 32 57 SEAP-AGE, ES
25977 30 44 HCCS, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:15 8:2 12:2 14:93 23:8
24:3 31:1 35:8 37:8 38:11 40:1
41:218 42:5 44:4 45:41 46:4 47:1
49:6 50:2 52:1 59:18 61:3 62:8
63:32 64:41 65:3 66:42 67:39 68:11
69:16 70:2 71:1 72:8 74:54 76:34
77:10 78:3 79:9 80:13 81:24 82:6
83:8 84:8 85:51 86:5 87:1 89:9
91:41 92:2 93:14 94:2 95:2 96:5
97:1 98:2 102:2 103:355 104:79 108:8
109:5 111:20 113:1 114:24 116:9 117:61
118:33 119:8 121:18 122:8 123:8 125:5
128:57 129:41 130:99 131:63 132:62 133:157
134:103 136:200 137:98 138:58 139:11 140:29
141:4 142:26 143:25 144:25 145:2 146:137
147:59 148:9 149:11 150:69 151:11 152:138
153:15 154:39 155:84 156:130 157:27 158:29
159:20 160:34 161:16 162:22 163:60 164:13
165:47 167:29 168:103 169:7 170:21 171:2
172:2 173:6 175:16 177:7 179:13 180:15
181:1 182:12 184:3 185:48 186:3 187:24
188:14 189:3 190:17 191:13 192:1306 193:300
194:140 195:82 196:146 197:334 198:517 199:239
200:287 201:37 202:567 203:439 204:384 205:174
206:206 207:310 208:62 209:163 210:143 211:3
212:144 213:4 216:93 217:21 218:23 219:6
220:17 222:1
End of report
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